2(x²-xy)-3(2x²-3xy)-2[X²-(2x²-xy+y²
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2(x²-xy)-3(2x²-3xy)-2[X²-(2x²-xy+y²)]
![2(x²-xy)-3(2x²-3xy)-2[X²-(2x²-xy+y²](/uploads/image/z/19303038-54-8.jpg?t=2%28x%26%23178%3B-xy%29-3%282x%26%23178%3B-3xy%29-2%5BX%26%23178%3B-%282x%26%23178%3B-xy%2By%26%23178%3B)
=2x²-2xy-6x²+9xy-2x²+4x²-2xy+2y²
=-2x²+5xy+2y²
=-2x²+5xy+2y²
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y
-3(2x²-xy)+4(x²+xy-6)
化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
下列多项式:(1)x²+xy-y²;(2)-x²+2xy-y²;(3)xy+x&
已知x/y=3,求(x²+2xy-3xy²)/(x²-xy+y²)
3x-2xy-8-2x+6xy-x²+6、-x²+2xy-y²-3x²-2xy+
合并同类项:(2xy²+3xy²)-(6x²y-3xy²)