2a+(x+y)-2(a+b)化简
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
因式分解:x^2y^2-4x a(a-b)-2b(b-a)
已知实数a,b,x,y,满足不等式(a+b)(x+y)>2(ay+bx),求证(x-y)/(a-b)+(a-b)/(x-
化简(-y-2/x)÷(x+2/y)的结果 【备用选项 A.-y/x B.-x/y C.x/y D.y/x 】 好了再加
(x-A)*(B-y)=x^2-9xy+8y^2,求A,B
因式分解:①10a(x-y)^2-5b(y-x)②x(a-x)(a-y)-y(x-a)(y-a)③6(2a+b)(2a-
(x+y)(a-2b)
1.x(x-y)+y(y-x)2.9(a-b)^2-16(a+b)^2 3.25(x-y)^2+10(y-x)+1
3a(x+y)-2b(x+y)=(x+y)(?)
对于有理数a,b,定义:a*b=3a-2b,若x,y均为有理数,试计算【(x+y)*(x-y)】*2 x.
因式分解2x²y-xy-3y (-a+b)+c²(a-b)
(-2a-b)②-(-2a+b)(-b-2a) (x-y+z)(-x+y+z)+(x-y)②其中z=-1