【1】7a-3a 【2】4X^2+2X^ 【3】5ab^2-13ab^2 【4】-9X^2y^3+9X^2y^3
(1)2(a^2-ab)-2a^2+3ab (2)5(2x-7y)-3(4x-10y) (3)(x+y)-[3x+(-x
因式分解 1)9x^4-25y^6 2)4x^2+(x+y)^2+4x(x+y) 3)(a+2b)^2-4ab-13b^
①[(x+y)^2-(x+y)(x-y)]/2y②(-1/3a^3b^2)^2(-2ab^2)^3/(1/9a^4b^4
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
约分 2x三次+x分之1-4x四次方 y-x平方y分之x平方y-2xy+y a平方-6ab+9b平方分之a平方-3ab
计算:(2a-5b)(2a^2-3ab+b^2) (3x+2y)(2x+3y)-(x-3y)(3x+4y)
x²(x+y)(y-x)-xy(x+y)(x-y) 已知a+b=4,ab=-2,求多项式3a²b+3
(-1/3a^2b^2)^2(-2ab^2)^3÷(1/9a^4b^4)^3 [(x+y)^2-(x+y)(x+y)]÷
ab-a*1/3b=?3x*5x-3x*2y=?
分解因式:3a^2-9ab ,4x^3y+x^2y^2+2xy^3 ,4x^4-4x^3+6x^2
通分;2/3a与3/-4ab²;1/x-y与2/x²-y²;2/x²-9与x/6
3a-3b/10ab*25a^b3/a^-b^= x^-4y^/x^+2xy+y^/x+2y/2x^+2xy