1. C, 2.C, 3.D ,

\(\Leftrightarrow\frac{x\left(x+2\right)}{\left(x-1\right)\left(x+2\right)}=\frac{\left(x-1\right)^2}{\left(x+2\right)\left(x-1\right)}\)\(\Rightarrow x\left(x+2\right)=\left(x-1\right)^2\)

                                                                                      \(\Leftrightarrow x^2+2x=x^2-2x+1\)

                                                                                       \(\Leftrightarrow4x-1=0\)\(\Leftrightarrow x=\frac{1}{4}\)

\(\frac{x}{x-1}=\frac{x-1}{x+2}\)

<=> x(x + 2) = (x - 1)²

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

<=> x^2 + 2x - x^2 + 2x - 1 = 0

<=> 4x - 1 = 0

<=> 4x = 1

<=> x = 1/4

a) \(\frac{x^3+4x^2+x-2}{x+1}=\frac{\left(x+1\right)\left(x^2+3x-2\right)}{x+1}=x^2+3x-2\)

b) \(\frac{x-3}{2x-2}+\frac{1}{x-1}=\frac{x^2-2x+1}{2x^2-4x+2}=\frac{\left(x-1\right)\left(x-1\right)}{2\left(x-1\right)\left(x-1\right)}=\frac{1}{2}\)

a, 6,36-2x=1,64

<=>-2x=1,64-6,36

<=>-2x=-4,72

<=>x=2,36

b,0,25x+1,5=0

<=>0,25x=-1,5

<=>x=-6

c,x+1=x-10

<=>x-x=-10-1

<=>0x=-11

=> PT vô nghiệm

Tìm x hửm?

a) 6.36 - 2x = 1.64

    => 2x= 4.72

    => x = 2.36

b) 0.25x + 1.5 = 0

=> 0.25x = -1.5

=> x = -6

c tự lm hem :'>

___Yu___

a, =-3y/5

b,A=x²-2x.1/2+1/4+3/4=(x-1/2)²+3/4 > hoặc=3/4 suy ra >0 với mọi x thuộc R

Giải rõ ra hộ mình với ạ