计算 (_2x²y³)²×(4xy²)-¹×(2x²y)
计算 (_2x²y³)²×(4xy²)-¹×(2x²y)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算:(-7x²y)(2x²y-3xy³+xy)
计算:(xy-x²)×x-y/xy
计算x²y³-2x(4xy³)
二次函数y=x²_2x+6的最小值是
计算:x²y-(2xy²-5x²y)+3xy²-y³
计算:x²+2xy+y²/xy-y².x²-2xy+y²/xy+y
分式计算:(x²+2xy+y²)/(x²y+xy)*y/(x+y)
计算:(3x³y)²*(4y)²÷(2xy)³
计算:(xy-x²)乘 x-y分之xy
计算 (x²+2xy+y²)(x²-xy+y²)²