Đáp án:
a,2x-3=5
2x =5+3=8
x =8:2=4
b,(x+2)(3x-15)
*)x+2=0⇒x=0-2=-2
*)3x-15=0⇔3x=15⇒x=15:3=5
Vậy x=\(\left[ \begin{array}{}x=-2\\x=5\end{array} \right.\)
c,$\frac{3}{x+1}$ -$\frac{2}{x-2}$ =$\frac{4x-2}{(x+1)(x-2)}$ Đk:x$\neq$ -1 và 2
⇔$\frac{3(x-2)-2(x+1)}{(x+1)((x-2)}$= $\frac{4x-2}{(x+1)(x-2)}$
⇒3x-6-2x-2=4x-2
⇔-3x=6
⇔x=-2
Chúc bn hk tốt:))
