(1)3x^2-[7x-(4x-3)-2x^2]

来源：学生作业帮编辑：搜狗做题网作业帮分类：数学作业时间：2024/08/18 16:52:30

(1)3x^2-[7x-(4x-3)-2x^2]
(2)(2xy-y)-(-y+yx)
(3)5(a^2b-3ab^2)-2(a^2b-7ab^2)
(4)11x^2+4x-1-x^2-4x-5
(5)(2x^4-4x^3y-2x^2y^2)-(x^4-2x^2y^2+y^3)+(-x^4+4x^3y-y^3)
注:x^2表示x的2次方,x^4表示x的4次方.

俺不是高手,俺问问是因式分解么?
(1)3x^2-[7x-(4x-3)-2x^2]
=3x^2-7x+4x-3+2x^2
=5x^2-3x-3
(2)(2xy-y)-(-y+yx)
=2xy-y+y-xy
=xy
(3)5(a^2b-3ab^2)-2(a^2b-7ab^2)
=5a^2b-15ab^2-2a^2b+14ab^2
=3a^2b-ab^2
(4)11x^2+4x-1-x^2-4x-5
=10x^2-6
(5)(2x^4-4x^3y-2x^2y^2)-(x^4-2x^2y^2+y^3)+(-x^4+4x^3y-y^3)
=2x^4-4x^3y-2x^2y^2-x^4+2x^2y^2-y^3-x^4+4x^3y-y^3
=-2y^3

|X-1|+|X-2|+|X-3|+|X-4|+|X-5|+|X-6|+|X-7|+|X-8|+|X-9|+|X-10| x+2/x+1-x+3/x+2-x+4/x+3+x+5/x+4 x^5+x^4 = (x^3-x)(x^2+x+1)+x^2+x x+2x+3x+4x+5x+6x+7x+8x+9x=9x-8x-7x-6x-5x-4x-3x-2x-x.x等于多少? 已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^5+x^6+x^7+x^8的值已知1+x+x^2+x^3=0,求x+x^2+x^3+x^4+x^+x^6+x^7+x^8的值 y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1 设函数f(x)=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10), （1） x-3/x-2 - x-5/x-4=x-7/x-6 - x-9/x-8 1x+2x+3x+4x+5x+6x+7x…+99x=100 (X+2)/(X+1)-(X+4)/(X+3)=(X+6)/(X+5)-(X+8)/(X+7) 解方程 x+2/x+1+x+8/x+7=x+6/x+5+x+4/x+3