x=a^2b^2+5,y=2ab-a^2-4a,若x>y,则实数a,b满足的条件是我的问题是,这道题应该怎么答啊很多人的答案是 a不等于-2并且b不等于-1/2这个并且是啥意思啊,考试能算对吗?我想答的是a=-2时b不等于-1/2b=-1/2时

5a^2b(x-y)^3乘[-2ab(x-y)^2]^3= 已知A=2x-y,B=x+y,计算A^2-2AB A=2x-y,B=x+y,计算：A平方-2AB乘法公式 几道 数学题急啊 对了再加20分(x+y)^2-(x+y)^3(x-y)^2-(x-y)^3 (x-y)^2-(y-x)^32(x-y)-3(y-x)^24ab(a+b)^2-6a^2b(a+b)(x+y)(x-y)-(x+y)^28a(x-y)^2-4b(y-x)a=-5 a+b+c=-5.2求代数式a^2(-b-c)-3.2a(c+b)的值 初一因式分解练习题,谁好心帮我解下表示平方1.2X~-3XY-X2.(X+Y)~(X+Y)(X-Y)(X+Y)(Y+Z)3.3X(a+2b)~-6XY(a+2b)4.a(x-y)-b(X-Y)-C(Y-X)5.(b-a)~-2a+2b6.(x-y)~-m(y-x)+y-x7.x(x-y)(a-b)-y(y-x)(b-a)8.已知a+b=13,ab=40,求 b+ab~的值 已知A=2x+y,B=2x-y,计算AB-B的平方 a^2b(x-y)-ab(y-x) y=log1/2[a^2x+2(ab)^x-b^2x+1](a>0 b>0)求y 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 化简:5*a‘2/5ab= ,9a*b'2+6abc/3*a'2*b= ,(x+y)y/x*y'2= 设x=a^2b^2+5,y=2ab-a^2-4a,若x>y.则实数a,b应满足的条件为? 几道比例线段题目已知两实数a,b满足a^2-4ab+4b^=0,求(a+b)/a已知x/2=y/3,求(x-y)/y ,(x+y)/y ,(x+y)/(x-y) 设x=a²b²+5,y=2ab-a²-4a,若x>y,则实数a,b需满足什么条件? 已知实数a,b,x,y满足a b=x y=2,ax by=5,则(a^2 b^2)xy ab(x^2拜托了各位 已知实数a,b,x,y满足a b=x y=2,ax by=5,则(a^2 b^2)xy ab(x^2 y^2)=?请写清过程, (1)(x+y)^2-(x+y)^3(2)(x-y)-(x-y)^3(3)(x-y)^2-(y-x)^3(4)2(x-y)-3(y-x)^2(5)4ab(a=b)^2-6a^2b(a+b)(6)(x+y)^2(x-y)+(x+y)(x-y)^2(7)2a(a-3)^2-6a^2(3-a)+8a(a-3)(8)24xy^2z^2(x+y-z)-32xyz(z-x-y)^2+8xy(z-x-y)(9)(a-b)(b-a)^n(b-a)^2n-1 [两解）（10）2^2=3,2^b (x+a)(x+b)=x∧2+(a+b)x+ab(a,b为常数) 利用上述规律计算:(x+a)(x+b)=x∧2+(a+b)x+ab(a,b为常数) 利用上述规律计算:(1):(x+5)(x-4) (2):(x∧2+y)(x∧2-3y) X+3=7—y a,b互为倒数,则1/2x(X+y)+5ab等于多少?