(-3xy²)³+(-2x²)(-xy²) 化简
-3(2x²-xy)+4(x²+xy-6)
化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y
2x²-12xy²+8xy³
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
计算:-2x²y(-2xy²)²+(2xy)³·(xy²)
合并同类项:(2xy²+3xy²)-(6x²y-3xy²)
(3x²y-xy²+2xy)/二分之一xy
已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值
化简-3x²y+2x²y+3xy²-2xy²
化简(3X²-XY+Y²)-5(X²-XY+2Y²)