1.(x^-1y^-2)^3(-2x^-2Y^-3)^-1 2.a^-2b^-3(-4a^-1b^2)÷8a^-4 b^
1.已知集合A={(x,y)|y=2x+1},B={(x,y)|y=x+3},a∈A,b∈B,求a
计算 1.[(a+b)^2-(a+b)(a-b)]÷(-b) 2.[(x+y)(2x+y)+(x+y)(x-y)]÷3x
分解因式1.x^2+y^2+2x+6y+10 2.(1-y)^3+4(y-x) 3.(a-c)^2-4(a-b)(b-c
(3x-y)(3x+y)+y(x+y);(a+1/2b)(a-1/2b)-(3a-2b)(3a+2b)快点,
1.(4x-3y)-[2(x-1)+2y-3] 2.(2a-5b)-{-3b-2[4a-2(3a-b)}
因式分解 (1)6(x-y)^3-3y(y-x)^2 (2)x(x-y)(a-b)-y(y-x)(
把(a+b)和(x+y)各看成一项,合并同类项:(1)4(a+b)+2(a+b)-(a+b); (2)3(x-y)^2-
计算:(1) (2x-3y)+(5x+4y) (2) (8a-7b)-(4a-5b)
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
已知A=2x-4y,B=-2x的2次方+6x-3{y-x},求:{1}2A-B{2}3A-B
分解因式1.2a(x-y)-3b(y-x)2.-x^y-2xy+35y3.a^(x-y)-4b^(x-y)若|a+2|+
(3a+b)(3a-b) (-1/2a-b) (3y+2x)^2 (3ab+2b)^2 -8a^4b^/6ab^2 (3