\(a.2^6.\left(x-2\right)=104\)

\(x-2=104:2^6\)

\(x-2=1,652\)

\(x=1,625+2\)

\(x=3,625\)

\(b.2\times4^{x+1}=128\)

\(4^{x+1}=128:2\)

\(4^{x+1}=64\)

\(4^{x+1}=4^3\)

\(\Rightarrow x+1=3\)

\(x=3-1\)

\(\Leftrightarrow x=3\)

\(c.227-5\left(x+8\right)=3^6:3^3\)

\(227-5\left(x+8\right)=3^3\)

\(227-5\left(x+8\right)=27\)

\(5\left(x+8\right)=227-27\)

\(5\left(x+8\right)=200\)

\(x+8=200:5\)

\(x+8=40\)

\(x=40-8\)

\(x=32\)

ủng hộ mk nha, chắc đúng đó

cả tháng nay ms online lại

thx bn

a: 3x-2=2x-3

=>x=-1

b: 2x+3=5x+9

=>-3x=6

=>x=-2

c: 5-2x=7

=>2x=-2

=>x=-2

d: 10x+3-5x=4x+12

=>5x+3=4x+12

=>x=9

e: 11x+42-2x=100-9x-22

=>9x+42=78-9x

=>18x=36

=>x=2

f: 2x-(3-5x)=4(x+3)

=>2x-3+5x=4x+12

=>7x-3=4x+12

=>3x=15

=>x=5

\(P\left(x\right)=x^2+5x^4-3x^3+x^2+4x^4+3x^3-x+5\)

\(=\left(5x^4+4x^4\right)+\left(-3x^3+3x^3\right)+\left(x^2+x^2\right)-x+5\)

\(=9x^4+2x^2-x+5\)

\(Q\left(x\right)=x-5x_{}^3-x^2-x^4+4x^3-x^2+3x-1\)

\(=\left(-5x^4-x^4\right)+4x^3+\left(-x^2-x^2\right)+\left(x+3x\right)-1\)

\(=-6x^4+4x^3-2x^2+4x-1\)

P(x)+Q(x)

\(=9x^4+2x^2-x+5-6x^4+4x^3-2x^2+4x-1\)

\(=3x^4+4x^3+3x+4\)

Đặt P(x)+Q(x)=0

=>\(3x^4+4x^3+3x+4=0\)

=>\(x^3\left(3x+4\right)+\left(3x+4\right)=0\)

=>\(\left(3x+4\right)\left(x^3+1\right)=0\)

=>\(\left[\begin{array}{l}3x+4=0\\ x^3+1=0\end{array}\right.\Longrightarrow\left[\begin{array}{l}x=-\frac43\\ x=-1\end{array}\right.\)

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