(-4xy³)(-xy)+(-3xy²)²
-3(2x²-xy)+4(x²+xy-6)
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
计算 [-(xy)²]³
(3xy)² · (x²+xy-y²)-3xy(3x³y+3x²y
[-xy/(x-y)²]²×(y²-xy/x)³
计算[5xy²(x²-3xy)-(-3x²y²)³]÷(-5xy)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
【回答后给分】【初一下】计算:①(4xy)·(-2xy³) ②(-xy²z³)²
先化简,再求值:{xy(x²-3y)+3xy²}(-2xy)+x³y²(2x-y
化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
2x²-12xy²+8xy³
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy