作业帮化简：（1）a^2-2(ab-b^2)-b^2 (2)(x^2-y^2)-3(2x^2-3y^2) (3)7a^b-(-
来源：学生作业帮 编辑：拍题作业网作业帮 分类：数学作业 时间：2024/04/30 00:33:17
化简：（1）a^2-2(ab-b^2)-b^2 (2)(x^2-y^2)-3(2x^2-3y^2) (3)7a^b-(-4a^2b+5ab^2)-2(2a^b-3ab^2)
（1）a^2-2(ab-b^2)-b^2
=a^2-2ab+2b^2-b^2
=a^2-2ab+b^2
(2)(x^2-y^2)-3(2x^2-3y^2)
=x^2-y^2-6x^2+9y^2
=x^2-6x^2-y^2+9y^2
=-5x^2+8y^2
(3)7a^2b-(-4a^2b+5ab^2)-2(2a^2b-3ab^2)
=7a^2b+4a^2b-5ab^2-4a^2b+6ab^2
=7a^2b+4a^2b-4a^2b-5ab^2+6ab^2
=7a^2b+ab^2
=a^2-2ab+2b^2-b^2
=a^2-2ab+b^2
(2)(x^2-y^2)-3(2x^2-3y^2)
=x^2-y^2-6x^2+9y^2
=x^2-6x^2-y^2+9y^2
=-5x^2+8y^2
(3)7a^2b-(-4a^2b+5ab^2)-2(2a^2b-3ab^2)
=7a^2b+4a^2b-5ab^2-4a^2b+6ab^2
=7a^2b+4a^2b-4a^2b-5ab^2+6ab^2
=7a^2b+ab^2
分解公因式的题 x（a-x）(a-y)-y(x-a)(y-a)-ab(a-b)^2+a(b-a)^2a^3b-ab2ab
几道因式分解..4ab(a+b)^2-6a^2b(a+b)(x+y)^2(x-y)+(x+y)(x-y)^22a(a-3
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)(
(3x-y)(3x+y)+y(x+y);(a+1/2b)(a-1/2b)-(3a-2b)(3a+2b)快点,
有理数ab定义:a*b=3a+2b.则[（x+y)*(x-y)]*3x.怎么化简?
ab是有理数a*b=2a-3b求【（x-y)*（x+y)】*x的值
x²（x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3
(x+y)(a-2b)
3x(a-b)-2y(b-a) 因式分解
(3a+b)(3a-b) (-1/2a-b) (3y+2x)^2 (3ab+2b)^2 -8a^4b^/6ab^2 (3
①[(x+y)^2-(x+y)(x-y)]/2y②（-1/3a^3b^2)^2(-2ab^2)^3/(1/9a^4b^4
计算 1.[(a+b)^2-(a+b)(a-b)]÷(-b) 2.[(x+y)(2x+y)+(x+y)(x-y)]÷3x