(3xy-2x²-3y²)+(x²-5xy+3y²) 计算
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算:(-7x²y)(2x²y-3xy³+xy)
计算:x²y-(2xy²-5x²y)+3xy²-y³
计算[5xy²(x²-3xy)-(-3x²y²)³]÷(-5xy)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
计算(2x³-3x²y-2xy²)-(x³-2xy²+y³)
化简(3X²-XY+Y²)-5(X²-XY+2Y²)
计算[xy(x²-3y)+3xy²]·(-2xy)+x³y²(2x-y)
计算:(xy-x²)×x-y/xy
计算:(xy-x²)乘 x-y分之xy
计算3x/8y×16y²/27x² (2xy-x²)÷x-2y/xy 2x-6/x
计算:3xy[2xy-x(y-2)+x]