计算:x²y-(2xy²-5x²y)+3xy²-y³
计算:(xy-x²)×x-y/xy
计算:(-7x²y)(2x²y-3xy³+xy)
计算:x²y-(2xy²-5x²y)+3xy²-y³
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算:x²+2xy+y²/xy-y².x²-2xy+y²/xy+y
计算:(xy-x²)乘 x-y分之xy
计算(2x³-3x²y-2xy²)-(x³-2xy²+y³)
计算[xy(x²-3y)+3xy²]·(-2xy)+x³y²(2x-y)
分式计算:(x²+2xy+y²)/(x²y+xy)*y/(x+y)
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
计算[5xy²(x²-3xy)-(-3x²y²)³]÷(-5xy)
-2y³+(3xy²-x²y)-2(xy²-y³)