用提公因式法做(1) x^4-x^3y (2)2ab+6b (3)5x^2y+10xy^2-15xy (4)3x(m-n

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：2024/05/21 03:27:18

用提公因式法做
(1) x^4-x^3y (2)2ab+6b (3)5x^2y+10xy^2-15xy (4)3x(m-n)+2(m-n)
(5)3(x-3)^2-6(3-x) (6)y^2(2x+1)+y(2x+1)^2 (7)a^2b(a-b)+3ab(a-b)

(1) x^4-x^3y
=x^3(x-y)
(2)2ab+6b
=2b(a+3)
(3)5x^2y+10xy^2-15xy
=5xy(x+2y-3)
(4)3x(m-n)+2(m-n)
=(m-n)(3x+2)
(5)3(x-3)^2-6(3-x)
=3(x-3)[(x-3)+2]
=3(x-3)(x-1)
(6)y^2(2x+1)+y(2x+1)^2
=y(2x+1)(y+2x+1)
(7)a^2b(a-b)+3ab(a-b)
=ab(a-b)(a+3)

用提公因式法做(1) x^4-x^3y (2)2ab+6b (3)5x^2y+10xy^2-15xy (4)3x(m-n 分式的约分要步骤xy+xy^2-----------------分数线x^2y^3+x^2y^4是不是先用提公因式法已知 2x-y=1\3 ,xy=2,求2x^4y^3-x^3y^4的值运用提公因式法 3a-3b/10ab*25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy 一,计算(1)5a^2b*(-2ab^2)^3 (2)(12x^3y-20xy)/4xy二,化简,求值(m+2n)^2- 分解公因式p(x-y)-q(y-x)(a+b)(a-b)-(b+a)10a(x-y)^2-5b(y-x)3p(m-2n) 已知(x+y+3)(x-my+n)=x平方-xy-2y平方+5x-4y=6,求m,n的值 [-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y- x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2 初一单项式和多项式1.3 2 2 2xy -3 -1/4 +1 x-y -m n 1/x x/4 4-x ab 2/x+ （-3x^y+2xy)-( )=4x^+xy (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)