\(^{x^2}\).(x-1)-5x.(1-x)=0
\(\Leftrightarrow\)\(^{x^2}\).(x-1)+5x.(x-1)=0
\(\Leftrightarrow\)(x-1).(\(^{x^2}\)+5x)=0
\(\Leftrightarrow\)(x-1).x.(x+5)=0
\(\Leftrightarrow\)\(\left[{}\begin{matrix}x-1=0\\x=0\\x+5=0\end{matrix}\right.\)\(\Leftrightarrow\)\(\left[{}\begin{matrix}x=1\\x=0\\x=-5\end{matrix}\right.\)
Vậy x\(\in\)\(\left\{-5;0;1\right\}\)
thu gọn biểu thức
a) (6x-2)2+4(3x-1)(2+y)+(y+2)2-(6x+y)2
b)5(2x-1)2+2(x-1)(x+3)-2(5-2x)2-2x(7x+12)
c)2(5x-1)(x2-5x+1)+(x2-5x+1)2+(5x-1)2-(x2-1)(x2+1)
d)(x2+4)2-(x2+4)(x2-4)(x2+16)-8(x-4)(x+4)
Tìm x biết
1.x(x+1)-x2+1=0
2.4x.(x-2)-6+3x=0
3.x(x+2)-3(x+2)=0
Bài 1: Thu gọn các biểu thức sau
a)(2x2 + 5x - 2)(2x2 - 4x +3)
b)(2x -3)(3x - 2) - 3x(2x - 5)
c)(x -1)(x2 + x + 1) - (x + 1)(x2 - x +1)
d)(x2 + x - 1)(x2 - x + 1)
e)(2 + 3y)2 - (2x -3y)2 -12xy
d)(x2 - 4x)(5 + 2x - x2)
cảm ơn!giúp mình với chiều nay ktra 15ph T_T
1.(x+2)3+(x-3)2-x2(x+5)
2.(2x+3).(x-5)+2x(3-x)+x-10
3.(x+5).(x2-5x+25)-x(x-4)2+16x
4.(-x-2)3+(2x-4).(x2+2x+4)-x2.(x-6)
(x+2)(x+3)-x2+5x=18 tìm x ?
(x+2)(x-3)-x2+5x=18 tìm x ?
chứng minh rằng x2-5x+7>0 với mọi x
Tìm x biết:
a) (x-1)(x^2+x+1) - x(x+2)(x-2) = 5
b) (6x-2)^2 + (5x-2)^2 - 4(3x-1)(5x-2) = 0
c) (x+1)^3 - x(x-2)^2 + x - 1 = 0
Tìm x biết
1.(x+3)2-(x+2).(x-2)=4x+17
2.(2x+1)2-(4x-1).(x-3)-15=0
3.(2x+3).(x-1)+(2x-3).(1-x)=0
4.2(5x-8)-3(4x-5)=4(3x-4)+11
5.(3x-1).(2x-7)-(1-3x).(6x-5)=0
Tìm x biết
1. 2(5x-8)-3(4x-5)=4(3x-4)+11
2. (2x+1)2-(4x-1).(x-3)-15=0
3. (3x-1).(2x-7)-(1-3x).(6x-5)=0