计算,5/2xy乘(-x³y²+4/5x²y³)
计算:(xy-x²)乘 x-y分之xy
计算:x²y-(2xy²-5x²y)+3xy²-y³
计算x²y³-2x(4xy³)
计算:(-7x²y)(2x²y-3xy³+xy)
计算(-4xy)乘(xy+3x²y)
分解因式计算6x³y(x-y)³-4xy³(y-x)²
分式计算2x/(5x-3)除3/(25x²-9)乘x/(5x+3) 通分x-y/(2x+2y)与xy/(x+y
计算[5xy²(x²-3xy)-(-3x²y²)³]÷(-5xy)
【计算】(-2x²y)²÷(2x的5次方y)(-xy²)³
计算(2x³-3x²y-2xy²)-(x³-2xy²+y³)
讨论:x²+4y²-4x+4y=5,x四次方-y四次方/x²+xy-2y²乘x-
计算4(x+y)^5(x-y)^4÷[2(x+y)³*(y-x)²]