bài nào vậy

ở giữa ý

Đề yêu cầu tìm số abcd phải không bn

\(52:\left(x+3\right)=14\)

\(\Rightarrow x+3=52:14=\frac{26}{7}\)

\(\Rightarrow x=\frac{26}{7}-3=\frac{5}{7}\)

Vậy \(x=\frac{5}{7}\)

52:(x+3)=14

=>x+3=52:14

=>x+3=26/7

=>x=26/7-3

=>x=5/7

Dạng 3 Bài 1)

`B=(sqrtx/(x-4)+1/(sqrtx-2)):(sqrtx+2)/(x-4)(x>=0,x ne 4)`

`=(sqrtx/(x-4)+(sqrtx+2)/(x-4)):1/(sqrtx-2)`

`=(2sqrtx+2)/(x-4)*(sqrtx-2)`

`=(2sqrtx+2)/(sqrtx+2)`

`b)C=A(B-2)=(sqrtx+2)/(sqrtx-2)*(2sqrtx+2-2sqrtx-4)/(sqrtx+2)`

`=-2/(sqrtx-2)`

Vì `x in ZZ=>sqrtx-2 in ZZ`

`=>-2 vdots sqrtx-2`

`=>sqrtx-2 in Ư(-2)={+-1,+-2}`

`=>sqrtx in {1,3,0,4}`

`=>x in {1,9,0,16}`

Bài 2: 

a) Ta có: \(B=\dfrac{\sqrt{x}+3}{\sqrt{x}+1}+\dfrac{5}{\sqrt{x}-1}+\dfrac{4}{x-1}\)

\(=\dfrac{\left(\sqrt{x}+3\right)\left(\sqrt{x}-1\right)}{\left(\sqrt{x}+1\right)\left(\sqrt{x}-1\right)}+\dfrac{5\left(\sqrt{x}+1\right)}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)}+\dfrac{4}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)}\)

\(=\dfrac{x-\sqrt{x}+3\sqrt{x}-3+5\sqrt{x}+5+4}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)}\)

\(=\dfrac{x+7\sqrt{x}+6}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)}\)

\(=\dfrac{\left(\sqrt{x}+1\right)\left(\sqrt{x}+6\right)}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)}\)

\(=\dfrac{\sqrt{x}+6}{\sqrt{x}-1}\)

b) Ta có: \(C=\left(AB+\dfrac{x-5}{\sqrt{x}-5}\right)\cdot\dfrac{\sqrt{x}-5}{\sqrt{x}}\)

\(=\left(\dfrac{\sqrt{x}-1}{\sqrt{x}-5}\cdot\dfrac{\sqrt{x}+6}{\sqrt{x}-1}+\dfrac{x-5}{\sqrt{x}-5}\right)\cdot\dfrac{\sqrt{x}-5}{\sqrt{x}}\)

\(=\dfrac{x-5+\sqrt{x}+6}{\sqrt{x}-5}\cdot\dfrac{\sqrt{x}-5}{\sqrt{x}}\)

\(=\dfrac{x+\sqrt{x}+1}{\sqrt{x}}\)

Ta có: \(C-3=\dfrac{x+\sqrt{x}+1}{\sqrt{x}}-\dfrac{3\sqrt{x}}{\sqrt{x}}\)

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

\(=\dfrac{\left(\sqrt{x}-1\right)^2}{\sqrt{x}}>0\forall x\) thỏa mãn ĐKXĐ

\(\Leftrightarrow C>3\)

she cleans her house every day 

S: she

V: cleans

O: her house

she(S) cleans(V) her(O) house every day 

ờm thíu đề pk khum?

nghe nó rối quá 

=>x(1/2+1/3+1/4)=11,7

=>x*13/12=11,7

=>x=10,8

tks cậu:33