3x²y-3xy²+xy = xy(3x-3y+1)

\(=\dfrac{11}{12}.\dfrac{12}{13}.\dfrac{13}{14}.\dfrac{14}{15}=\dfrac{11}{15}\)

ĐKXĐ:x>0;x\(\ne\) 1\(P=\left(\dfrac{\sqrt{x}-\left(1-\sqrt{x}\right)}{\left(1-\sqrt{x}\right)\sqrt{x}}\right):\left(\dfrac{\left(\sqrt{x}+1\right)\left(2\sqrt{x}-1\right)}{\left(1-\sqrt{x}\right)\left(1+\sqrt{x}\right)}+\dfrac{\sqrt{x}\left(\sqrt{x}+1\right)\left(2\sqrt{x}-1\right)}{\left(1+\sqrt{x}\right)\left(1-\sqrt{x}+x\right)}\right)\)\(P=\dfrac{\sqrt{x}-1+\sqrt{x}}{\sqrt{x}\left(1-\sqrt{x}\right)}:\left(\dfrac{2\sqrt{x}-1}{1-\sqrt{x}}+\dfrac{\sqrt{x}\left(2\sqrt{x}-1\right)}{1-\sqrt{x}+x}\right)\)

\(P=\dfrac{2\sqrt{x}-1}{\sqrt{x}\left(1-\sqrt{x}\right)}:\left(\dfrac{\left(2\sqrt{x}-1\right)\left(1-\sqrt{x}+x\right)+\sqrt{x}\left(2\sqrt{x}-1\right)\left(1-\sqrt{x}\right)}{\left(1-\sqrt{x}\right)\left(1-\sqrt{x}+x\right)}\right)\)

\(P=\dfrac{2\sqrt{x}-1}{\sqrt{x}\left(1-\sqrt{x}\right)}\) \(:\dfrac{\left(2\sqrt{x}-1\right)\left(1-\sqrt{x}+x+\sqrt{x}-x\right)}{\left(1-\sqrt{x}\right)\left(1-\sqrt{x}+1\right)}\)

\(P=\dfrac{2\sqrt{x}-1}{\sqrt{x}\left(1-\sqrt{x}\right)}\) :\(\dfrac{2\sqrt{x}-1}{\left(1-\sqrt{x}\right)\left(1-\sqrt{x}+x\right)}\)

\(P=\dfrac{2\sqrt{x}-1}{\sqrt{x}\left(1-\sqrt{x}\right)}\) \(.\dfrac{\left(1-\sqrt{x}\right)\left(1-\sqrt{x}+x\right)}{2\sqrt{x}-1}\)

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

Nếu An cho Bình 20 viên thì Bình có nhiều hơn An 16 viên nên lúc đầu An hơn Bình :20*2 -16 = 24 (viên)

Số bi của An là :

(120+24):2 = 72 (viên)

Số bi của Bình là:

120=72=48 (viên)

 (3x+5) \(⋮\) (x+1)

3(x+1) +2 \(⋮\) (x+1)

vì 3(x+1) \(⋮\) (x+1) 

nên 2\(⋮\) (x+1)

x+1 \(\in\) Ư(2)={1;2}

x\(\in\) {1}

A,2^x.4= 128

2^x= 32

2^x=2⁵

=>x=5

b, (2x+1)³= 125

(2x+1)³=5³

=> 2x+1 =5

2x=4

x=2

c,2^x-26 =6

2^x = 32

2^x=2⁵

=>x=5

D,64.4^x =4⁵

4³.4^x =4⁵

4^3+x = 4⁵

=> 3+x =5

x= 5-3

x=2

e,g(bn xem lại đề nhé)