\(\left(x+1\right)\left(x^2-x+1\right)-\left(x+2\right)\left(x^2-2x+4\right)\)
\(=x^3-x^2+x+x^2-x+1-\left(x^3-2x^2+4x+2x^2-4x+8\right)\)
\(=x^3+\left(x^2-x^2\right)+\left(x-x\right)+1-\left(x^3+8\right)\)
\(=x^3+0+0+1-x^3-8\)
\(=x^3-x^3+1-8\)
\(=-7\)
B1:tìm x biết a, (-2+x^2)(x^2-2)(x^2-2)(x^2-2)(x^2-2)=1 b, (2x+3)(x-4)+(x-5)(x-2)=(3x-5)(x-4) c,(8x-3)(3x+2)-(4x+7)(x+4)=(4x+1)(5x-1) d, 2x^2+3(x-1)(x+1)=5x(x+1) e, (8-5x)(x+2)+4(x-2)(x+1)=(2+x)(2-x) f, 4(x-1)(x+5)-(x+2)(x+5)=3(x-1)(x+2)
Bài 1:
a, (-2+x\(^2\))(x\(^2\)-2)(x\(^2\)-2)(x\(^2\)-2)(x\(^2\)-2)=1
b, (2x+3)(x-4)+(x-5)(x-2)=(3x-5)(x-4)
c, (8x-3)(3x+2)-(4x+7)(x+4)=(4x+1)(5x-1)
d,2x\(^2\)+3(x-1)(x+1)=5x(x+1)
e,(8-5x)(x+2)+4(x-2)(x+1)=(2+x)(2-x)
f, 4(x-1)(x+5)-(x+2)(x+5)=3(x-1)(x+2)
1)x^2.(2x^3-x^2+4x) 2)(x+2).(5x^3-3x^2+x) 3)(x^2-2).(x^2+2x-1) 4)(x^2+x+1).(x-1)
Bài 10.Rút gọn biểu thức:
a)(-x+1).(x2-2)-(1-x3-x2)
b)-4.(x+3).(x+4)+4x2-5x
c)(2x+3).(1-x)-(2x-1).3x
d)(x-1)2-(x-1).(-5x)
e)2x(x-3)+(x-2).(5-2x)
f)2(x-5).(2x+3)-(x-3).(x+1)
Giúp mình với mình cảm ơn mn ạ
Thực hiện phép tính
a) (2x^4-5x^2+x^3-3-3x):(x^2-3) b) (x^5+x^3+x^2+1):(x^3+1)
c) (2x^3+5x^2-2x+3):(2x^2-x-1) d) (8x-8x^3-10x^2+3x^4-5):(3x^2-2x+1)
Mik cần gấppp
1, |x+1|+|x-2|+|x+3|=6
2, 2.|x+2|+|4-x|=11
3, |x-2|+|x-5|=3
4, |x-3|+|x+5|=8
5, |2x-1|+|2x-5|=4
Tính giá trị của biểu thức sau :
A= 2x^2y+xy-3xy tại x=-2 và y=4
B= (2x^2+x-1)-(x^2+5x-1) tại x=-2
C= -x^4+3x^2-x^3+3-2x-x^2+x4+x^3-2x^2 tại x=3/2
7x^3-2x^2:-2x^2+(\(\dfrac{5}{4}\)x^2-3x):x-\(\dfrac{1}{2}\)x(x-1)(2x+1)
Tính(x)+g(x)và f(x)-f(x)với:
a)f(x)=x^5-3x^2+x^3-x^2-2x+5;g(x0=x^2-3x+1+x^2-x^4+X^5
b)f(x)=x^7-3x^2-x^5+x^4-x^2+2x-7;g(x)=x-2x^2+x^4-X^5-x^7-4x^2-1
2x(x^5+3x-y)
(x+4)(x-4)
(x-y)(x^2+xy+y^2)
(x-y)(X^2-xy+y^2)
(x-2)^2(X^2-2x+4)
(X^3-1)(X^2+x+1)
