计算:(-3x²y²)²•(2xy)³÷(xy)²
计算:(-3x²y²)²•(2xy)³÷(xy)²
计算:(xy-x²)×x-y/xy
计算:(-7x²y)(2x²y-3xy³+xy)
计算:-2x²y(-2xy²)²+(2xy)³·(xy²)
计算[5xy²(x²-3xy)-(-3x²y²)³]÷(-5xy)
计算:x²+2xy+y²/xy-y².x²-2xy+y²/xy+y
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算:2x+2y分之3y + x²+xy分之2xy
(-x²+2xy-y的平方)-2(xy—3x²)+3(2y的平方-xy) 计算.
计算:x²y-(2xy²-5x²y)+3xy²-y³
计算xy-y²分之x²+2xy+y²÷x²-2xy+y²分之xy+y&