Câu b :
\(\left(4x^2+2x+1\right)\left(2x-1\right)-4x\left(2x^2-3\right)=23\)
\(\Leftrightarrow8x^3-1-8x^3+12x-23=0\)
\(\Leftrightarrow12x-24=0\)
\(\Rightarrow x=2\)
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
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
Tìm x
a)2x(x+5)-x(3+2x)=26
b)5x(x-1)=x-1
c)2(x+5)-x2-5x=0
d)(2x-3)2-(x+5)2=0
e)3x3-48x=0
f)x3+x2-4x=4
g)(x-1)(2x+3)-x(x-1)=0
h)x2-4x+8=2x-1
Tìm x
a) ( 2x + 1 )2- 4x2 + 2x2 - 2 = 0
b) ( x - 2 ) . ( x + 2 ) - ( x + 3 )2 - 2x - 5 = 0
Giúp mình với ;-;
Tìm x biết
a, 3(1-4x)(x-1)+4(3x+2)(x+3)=38
b, 5(2x+3)(x+2)-2(5x-4)(x-1)=75
C, 2x^2+3(x-1)(x+1)=5x(x+1)
d, (8-5x)(x+2)+4(x-2)(x+1)+2(x-2)(x+2)=0
Giúp mk vs ạ mk đang cần
Tìm x:
a) (2x + 3). (x - 4) + (x - 5). (x - 2) = (3x - 5). (x - 4)
b) (8 - 5x). (x + 2) + 4.(x - 2). (x + 1) + 2.(x - 2). (x + 2) = 0
c) (8x - 3). (3x + 2) - (4x - 7). (x + 4) = (2x + 1). (5x - 1) - 33
Rút gọn các biểu thức sau:
a) 2x(2x-1)^2-3x(x+3)-4x(x+1)
b)(3x+1) (3^2+1) (3^4+1).....(3^100+1)
c) 5x(x^2-x)-x^2(5x-5) -15
d) (x+5)^2 - 4x(2x+3)^2 - (2x-1) (x+3) (x-3)
Tìm x
a) 5x(x+1)-5(x+1)(x-2) =0
b)(4x+1)( x-2 )- (2x-3) =4
c) 2x^3-18x =0
d) (3x-2)(2x+1)-6x(x+2) =11
e) (x-1)^3-(x+2)(x^2-2x+4) =3(1-x^2)
f) 6x^2-(2x+5)(3x-2) =-1
^( mũ)
Thanks trước nhoa
