Bài 1: Giải các phương trình sau:

a) 3(2,2-0,3x)=2,6 + (0,1x-4)

<=> 6.6 - 0.9x = 2,6 + 0,1x - 4

<=> - 0.9x - 0,1x = -6.6 -1,4

<=> -x = -8

<=> x = 8

Vậy x = 8

b) 3,6 -0,5 (2x+1) = x - 0,25(22-4x)

<=> 3,6 - x - 0,5 = x - 5,5 + x

<=> - x - 3,1 = -5,5

<=> - x = -2.4

<=> x = 2.4

Vậy  x = 2.4

a: \(\left(x+1\right)\left(-x^2+3x-2\right)<0\)

=>\(\left(x+1\right)\left(x^2-3x+2\right)>0\)

TH1: x+1>0 và \(x^2-3x+2>0\)

=>x>-1 và (x-2)*(x-1)>0

=>x>-1 và (x>2 hoặc x<1)

=>x>2

TH2: x+1<0 và \(x^2-3x+2<0\)

=>x<-1 và (x-2)(x-1)<0

=>x<-1 và 1<x<2

=>x∈∅

b: ĐKXĐ: x>=4

\(\sqrt{x^2-5x+4}+2\sqrt{x+5}>2\sqrt{x-4}+\sqrt{x^2+4x-5}\)

=>\(\sqrt{\left(x-1\right)\left(x-4\right)}-2\sqrt{x-4}-\sqrt{\left(x+5\right)\left(x-1\right)}+2\sqrt{x+5}\) >0

=>\(\sqrt{x-4}\left(\sqrt{x-1}-2\right)-\sqrt{x+5}\left(\sqrt{x-1}-2\right)>0\)

=>\(\left(\sqrt{x-1}-2\right)\left(\sqrt{x-4}-\sqrt{x+5}\right)>0\)

=>\(\sqrt{x-1}-2<0\)

=>\(\sqrt{x-1}<2\)

=>0<=x-1<4

=>1<=x<5

=>4<=x<5

b: Ta có: \(\left\{{}\begin{matrix}\left(x+5\right)\left(y-4\right)=xy\\\left(x+5\right)\left(y+12\right)=xy\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}xy-4x+5y-20-xy=0\\xy+12x+5y+60-xy=0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}-4x+5y=20\\12x+5y=-60\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}-16y=80\\-4x+5y=20\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=-5\\-4x=20-5y=20-5\cdot\left(-5\right)=45\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}y=-5\\x=-\dfrac{45}{4}\end{matrix}\right.\)

a: \(\left|-5x\right|+\left|7-x\right|=27\)

=>5|x|+|x-7|=27(1)

TH1: x<0

=>x<0; x-7<0

(1) sẽ trở thành: -5x+7-x=27

=>-6x=20

=>\(x=\frac{20}{-6}=-\frac{10}{3}\) (nhận)

TH2: 0<=x<7

=>x>=0; x-7<0

(1) sẽ trở thành: 5x+7-x=27

=>4x=20

=>x=5(nhận)

TH3: x>=7

=>x>0; x-7>=0

(1) sẽ trở thành: 5x+x-7=27

=>6x=34

=>x=34/6=17/3(loại)

b: |3x-1|+|x+4|=21(2)

TH1: x<-4

=>x+4<0; 3x-1<0

(2) sẽ trở thành: 1-3x-x-4=21

=>-4x-3=21

=>-4x=24

=>x=-6(nhận)

TH2: -4<=x<1/3

=>x+4>=0; 3x-1<0

(2) sẽ trở thành: 1-3x+x+4=21

=>-2x+5=21

=>-2x=16

=>x=-8(loại)

TH3: x>=1/3

=>x+4>0; 3x-1>=0

(2) sẽ trở thành: 3x-1+x+4=21

=>4x+3=21

=>4x=18

=>x=18/4=9/2(nhận)

c: \(2\left|3x\right|-5\left|x+2\right|=-7\)

=>6|x|-5|x+2|=-7

=>\(5\left|x+2\right|-6\left|x\right|=7\) (3)

TH1: x<-2

=>x+2<0; x<0

(3) sẽ trở thành: 5(-x-2)-6(-x)=7

=>-5x-10+6x=7

=>x=17(loại)

TH2: -2<=x<0

=>x+2>=0; x<0

(3) sẽ trở thành: 5(x+2)-6(-x)=7

=>5x+10+6x=7

=>11x=-3

=>x=-3/11(nhận)

TH3: x>=0

=>x+2>0; x>=0

(3) sẽ trở thành: 5(x+2)-6x=7

=>5x+10-6x=7

=>10-x=7

=>x=3(nhận)

a) \(x^2+2x=\left(x-2\right).3x\)

\(\Leftrightarrow x^2+2x=3x^2-6x\)

\(\Leftrightarrow x^2+2x-3x^2+6x=0\)

\(\Leftrightarrow-2x^2+8x=0\)

\(\Leftrightarrow-2x\left(x-4\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}-2x=0\\x-4=0\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=4\end{matrix}\right.\)

Vậy S = {0;4}

b) \(x^3+x^2-x-1=0\)

\(\Leftrightarrow x^2\left(x+1\right)-\left(x+1\right)=0\)

\(\Leftrightarrow\left(x+1\right)\left(x^2-1\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x+1=0\\x^2-1=0\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=-1\\x^2=1\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=-1\\x=\mp1\end{matrix}\right.\)

Vậy: S = {-1; 1}

c) \(\left(x+1\right)\left(x+2\right)\left(x+4\right)\left(x+5\right)=40\)

\(\Leftrightarrow\left[\left(x+1\right)\left(x+5\right)\right]\left[\left(x+2\right)\left(x+4\right)\right]=40\)

\(\Leftrightarrow\left(x^2+5x+x+5\right)\left(x^2+4x+2x+8\right)=40\)

\(\Leftrightarrow\left(x^2+6x+5\right)\left(x^2+6x+8\right)=40\)

Đặt x² + 6x + 5 = t

\(\Leftrightarrow t.\left(t+3\right)=40\)

\(\Leftrightarrow t^2+3t=40\)

\(\Leftrightarrow t^2+2.t.\dfrac{3}{2}+\dfrac{9}{4}=\dfrac{169}{4}\)

\(\Leftrightarrow\left(t+\dfrac{3}{2}\right)^2=\dfrac{169}{4}\)

\(\Leftrightarrow\left[{}\begin{matrix}t+\dfrac{3}{2}=\dfrac{13}{2}\\t+\dfrac{3}{2}=-\dfrac{13}{2}\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}t=\dfrac{13}{2}-\dfrac{3}{2}=\dfrac{10}{2}=5\\t=-\dfrac{13}{2}-\dfrac{3}{2}=-\dfrac{16}{2}=-8\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x^2+6x+5=5\\x^2+6x+5=-8\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x^2+6x=0\\x^2+6x+13=0\end{matrix}\right.\)

Mà: \(x^2+6x+13=x^2+2.x.3+9+4=\left(x+3\right)^2+4\ne0\)

=> x² + 6x = 0

<=> x. (x + 6) = 0

\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x+6=0\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-6\end{matrix}\right.\)

Vậy S = {0; -6}

a) Ta có: \(x^2+2x=\left(x-2\right)\cdot3x\)

\(\Leftrightarrow x\left(x+2\right)-3x\left(x-2\right)=0\)

\(\Leftrightarrow x\left[\left(x+2\right)-3\left(x-2\right)\right]=0\)

\(\Leftrightarrow x\left(x+2-3x+6\right)=0\)

\(\Leftrightarrow x\left(-2x+8\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=0\\-2x+8=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\-2x=-8\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=4\end{matrix}\right.\)

Vậy: S={0;4}

b) Ta có: \(x^3+x^2-x-1=0\)

\(\Leftrightarrow x^2\left(x+1\right)-\left(x+1\right)=0\)

\(\Leftrightarrow\left(x+1\right)\cdot\left(x^2-1\right)=0\)

\(\Leftrightarrow\left(x+1\right)\cdot\left(x-1\right)\cdot\left(x+1\right)=0\)

\(\Leftrightarrow\left(x+1\right)^2\cdot\left(x-1\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}\left(x+1\right)^2=0\\x-1=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x+1=0\\x-1=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=-1\\x=1\end{matrix}\right.\)

Vậy: S={-1;1}

c) Ta có: \(\left(x+1\right)\left(x+2\right)\left(x+4\right)\left(x+5\right)=40\)

\(\Leftrightarrow\left(x+1\right)\left(x+5\right)\left(x+2\right)\left(x+4\right)-40=0\)

\(\Leftrightarrow\left(x^2+6x+5\right)\left(x^2+6x+8\right)-40=0\)

\(\Leftrightarrow\left(x^2+6x\right)^2+13\left(x^2+6x\right)+40-40=0\)

\(\Leftrightarrow\left(x^2+6x\right)^2+13\left(x^2+6x\right)=0\)

\(\Leftrightarrow\left(x^2+6x\right)\left(x^2+6x+13\right)=0\)

\(\Leftrightarrow x\left(x+6\right)\left(x^2+6x+13\right)=0\)

mà \(x^2+6x+13>0\forall x\)

nên \(x\left(x+6\right)=0\)

\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x+6=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-6\end{matrix}\right.\)

Vậy: S={0;-6}

\(a,=>x^3-2x^2+4x+2x^2-4x+8-x^3+2x-15=0\)

\(< =>2x-7=0< =>x=\dfrac{7}{2}\)

b,\(=>x\left(x^2-25\right)-\left(x+2\right)\left(x^2-2x+4\right)-3=0\)

\(< =>x^3-25x-x^3+2x^2-4x-2x^2+4x-8-3=0\)

\(< =>-25x-11=0\)

\(< =>x=-0,44\)

cảm ơn bạn nhiều nha!

a: \(\Leftrightarrow x\left(2x+10\right)-x\left(x-2\right)=0\)

=>x(2x+10-x+2)=0

=>x(x+12)=0

=>x=0 hoặc x=-12

b: \(\Leftrightarrow\left(2x-5\right)\left(x+11\right)+\left(2x-5\right)\left(2x+1\right)=0\)

=>(2x-5)(3x+12)=0

=>x=5/2 hoặc x=-4

c: \(\Leftrightarrow\left(2x\right)^2-\left(x+3\right)^2=0\)

=>(x-3)(3x+3)=0

=>x=3 hoặc x=-1

d: \(\Leftrightarrow\left(x+2\right)\left(5-4x\right)-\left(x+2\right)^2=0\)

\(\Leftrightarrow\left(x+2\right)\left(5-4x-x-2\right)=0\)

=>(x+2)(-5x+3)=0

=>x=-2 hoặc x=3/5

\(a,\left(x-2\right)x=2x\left(x+5\right)\)

\(\Leftrightarrow\left(x-2\right)x-2x\left(x+5\right)=0\)

\(\Leftrightarrow x.\left(x-2-2x-10\right)=0\)

\(\Leftrightarrow x\left(-x-12\right)=0\Leftrightarrow\left\{{}\begin{matrix}x=0\\x+12=0\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0\\x=-12\end{matrix}\right.\)

a) Ta có: \(2\left(3x+1\right)-4\left(5-2x\right)>2\left(4x-3\right)-6\)

\(\Leftrightarrow6x+2-20+8x>8x-6-6\)

\(\Leftrightarrow14x-18-8x+12>0\)

\(\Leftrightarrow6x-6>0\)

\(\Leftrightarrow6x>6\)

hay x>1

Vậy: S={x|x>1}

b) Ta có: \(9x^2-3\left(10x-1\right)< \left(3x-5\right)^2-21\)

\(\Leftrightarrow9x^2-30x+3< 9x^2-30x+25-21\)

\(\Leftrightarrow9x^2-30x+3-9x^2+30x-4< 0\)

\(\Leftrightarrow-1< 0\)(luôn đúng)

Vậy: S={x|\(x\in R\)}

a: =>(x-2)(2x+5)=0

=>x-2=0 hoặc 2x+5=0

=>x=2 hoặc x=-5/2

c: \(\dfrac{2x}{x-1}-\dfrac{x}{x+1}=1\)

=>\(\dfrac{2x^2+2x-x^2+x}{x^2-1}=1\)

=>x^2+3x=x^2-1

=>3x=-1

=>x=-1/3

\(a,\Leftrightarrow\left(x-2\right)\left(2x+5\right)=0\\ \Leftrightarrow\left\{{}\begin{matrix}x-2=0\\2x+5=0\end{matrix}\right.\\ \Leftrightarrow\left\{{}\begin{matrix}x=2\\x=\dfrac{5}{2}\end{matrix}\right.\)

Vậy phương trình có tập nghiệm S = \(\left\{2;\dfrac{5}{2}\right\}\)

\(c,\Leftrightarrow2x.\left(x+1\right)-x.\left(x-1\right)=\left(x-1\right)\left(x+1\right)\)              ( ĐKXĐ: \(x\ne-1;x\ne1\) )

\(\Leftrightarrow2x^2+2x-x^2+x=x^2-1\\ \Leftrightarrow x^2-x^2+3x=-1\\ \Leftrightarrow3x=-1\\ \Leftrightarrow x=-\dfrac{1}{3}\)  ( nhận )

Vậy phương trình có tập nghiệm S = \(\left\{-\dfrac{1}{3}\right\}\)