6x(a²-b²)-18y(a-b)
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因式分解2x²y-xy-3y (-a+b)+c²(a-b)
(x-y)³-x+y (a+b)²-(a-b)² (x-3)³-4x+12
计算(x-y)(y-x)²·(x-y)³;(b-a)(a-b)³(a-b)的5次方.
已知|x-y-3|+(a+b+4)²=0,求2a+2b-(a+b)分之(x-y)²-3(y-x)的值
7(a-1)+x(a-1),3(a-b)²+6(b-a),2(m-n)²-m(m-n),x(x-y)
现定义一种新的运算“*”,规定a*b+2a-b(a、b为整式).当a=X²-y²,b=x²
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化简(a-b)²÷(ax+by-ay-xy)-(a-b)÷(x-y)
若集合A={(x,y)/x²+y²=1},B={(x,y)/y²=2(x+)},则A∩B=
计算:(a-b)(x-y)-(b-a)(x+y) 4+12(x-y)+9(x-y)²