(2xy)²·(-3x+2xy-4)计算
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算:3xy[2xy-x(y-2)+x]
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
计算:-2x²y(-2xy²)²+(2xy)³·(xy²)
计算 -3(2x²-xy)+4(x²+xy-6)
计算:(-7x²y)(2x²y-3xy³+xy)
计算[xy(x²-3y)+3xy²]·(-2xy)+x³y²(2x-y)
计算3xy[2xy-x(y-2)+x-1]
-3(2x²-xy)+4(x²+xy-6)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(-x²+2xy-y的平方)-2(xy—3x²)+3(2y的平方-xy) 计算.
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]