(-3Xy)(-2x²y)²化简
化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
化简-3x²y+2x²y+3xy²-2xy²
化简(3X²-XY+Y²)-5(X²-XY+2Y²)
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
化简2XY+(X-Y)²
化简:[(x+y)²-(x-y)²]÷2xy
化简3/(x²+2xy+y²)-4/(x²-2xy+y²)+5/(x²
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
化简(x²y-4y²)/(x²+4xy+4y²)*[(4xy)/(x-2y)+x
已知x:y=3:2,求(x²+3xy)/(xy+2xy)