\(x^2-3x=\left(x-2\right)\left(3-x\right)\\ x\left(x-3\right)-\left(x-2\right)\left(3-x\right)=0\\ x\left(x-3\right)+\left(x-2\right)\left(x-3\right)=0\\ \left(x-3\right)\left(x+x-2\right)\\ \left(x-3\right)\left(2x-2\right)=0\\ 2\left(x-3\right)\left(x-1\right)=0\\ \left[{}\begin{matrix}x-3=0\\x-1=0\end{matrix}\right.\left[{}\begin{matrix}x=3\\x=1\end{matrix}\right.\)
1. Thu gọn biểu thức
a) (x-3) ² + 3x (x-5)
b) (3x+2) ² - (x+3) (x-3)
2. Tìm x biết a) (x+4) ² - (x+2) (x-2)=5
b) (3x-1) ² _ (2x-3) (4x+1)= 5+x ²
Tìm x biết:
a) 2x(3x+1) – (2x+3)(3x-2) = 12
b) (x+2)2 – (x-3)(x+3) = 5
tìm x biết
2(x-1)-x(3-x)=x^2
3x(x+5)-2(x+5)=3x^2
Tìm x biết (x-1)^3-(x+3)(x^2-3x+9)+3(x-2)(x+2)=0
: Tìm x biết
a) (x + 1)3x – x( x -2)2 + x -1 = 0
b) ( x – 2)3 – x2(x -6) =4
c) ( x -1)( x2 + x + 1) – x( x+2)(x -2) =5
d) 3(x -1)2 – 3x( x -5) =1
tìm x biết (x+3)(x^2-3x+9)-x(x-2)^2=27
tìm x biết (x+3)*(x^2-3x+9)-x(x^2-2)=15
tìm x biết
a)(x+3)(x^2-3x+9)-x(x-2)^2=27
b) (x-1)(x-5)=3
Tìm x, biết:
a) (x-3)(x^2+ 3x +9)+x(2+x)(2x-x)=1
b) (x+3)^3 -x(3x+1)^2+(2x+1)(4x-2x+1)=54
