1.(2x+3).(x-5)+2x(3-x)+x-10
=2x^2 -10x+3x-15+6x-2x^2+x-10
=2x-25
2.(-x-2)3+(2x-4).(x2+2x+4)-x2.(x-6)
=-x^3+6x^2-12x-8+2x^3+4x^2+8x-4x^2+8x-16-x^3+6x^2
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)
1.(x+2)3+(x-3)2-x2(x+5)
2.(2x+3).(x-5)+2x(3-x)+x-10
3.(-x-2)3+(2x-4).(x2+2x+4)-x2.(x-6)
Thực hiện phép tính
1.(x-1)3-x(x-2)2+1
2.2x(3x+2)-3x(2x+3)
3.(x+2)3+(x-3)2-x2(x+5)
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:
a) (x-3)2-4=0
b) x2-2x=24
c) (x+4)2-(x+1)(x-1)=16
d) (2x+1)2-4(x-1)2=9
e) (x+3)2-(x-4)(x+8)=1
f) (2x-1)2+(x+3)2-5(x+7)(x-7)=0
g) 3(x+2)2+(2x-1)2-7(x+3)(x-3)=36
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
Thực hiện phép tính ( theo hằng đẳng thức đáng nhớ )
1. ( x - 2 ) mũ 2 - ( x + 3 ) mũ 2 + ( x+ 4 ) ( x-4 )
2. 2 ( 3x - 2 ) mũ 2 - 3 ( 2x + 5 ) mũ 2 - 6 ( x -1 ) ( x+ 1 )
3. ( 2x + 3 ) mũ 2 - 2 ( 2x + 3 ) ( 2x + 5 ) + ( 2x + 5 ) mũ 2
4. ( a + 1 ) ( a + 2 ) ( a mũ 2 + 4 ) ( a - 1 ) ( a mũ 2 + 1 ) ( a - 2 )
5. ( a + 2b - 3c - d ) ( a + 2b + 3c + d ) - ( a mũ 2 + 4ab + 4b mũ 2 )
Các bạn có thể giúp mik đc ko, mik cảm ơn các bạn nhiều !!!!
Rút gọn :
1. (2x-5)(3x+1)-(x-3)^2+(2x+5)^2-(3x+1)^3
2. (2x-1)(2x+1)-3x-2)(2x+3)-(x-1)^3+(2x+3)^3
3. (x-2)(x^2+2x+4)-(3x-2)^3+(3x-4)^2
4. (7x-1)(8x+2)-(2x-7)^2-(x-4)^3-(3x+1)^3
5. (5x-1)(5x+1)-(x+3)(x^2-3x+9)-(2x+4)^2-(3x-4)^2+(2x-5)^3
6. (4x-1)(x+2)-(2x+5)^2-(3x-7)^2+(2x+3)^3=(3x-1)^3
Rút gọn:
A=(x-3)²-(2x-1)(2x+1)
B=(2x-3)²-(x-1)(2x+1)
C=4x(x-3)-(4-2x)²
D=3x(x-1)(x-2)-x(2x-1)²
E=(4-x)(x+4)-(x+2)²
P=(2x+3)²-(2x+1)(2x-1)
Q=(4-3x)²-(9x-1)(9x+1)
M=(5+x) (x-5)-(x-3)²
N=2(3x+1)(x-2)-6(x+2)²