5x²-3xy²-2(2x²y-xy²)怎么写?
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
化简(3X²-XY+Y²)-5(X²-XY+2Y²)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
计算:(-7x²y)(2x²y-3xy³+xy)
化简3/(x²+2xy+y²)-4/(x²-2xy+y²)+5/(x²
计算;(xy-x²)÷x²-2xy+y²/xy · x-y/x²
(xy-x²)除以xy分之x²-2xy+y²乘以x²分之x-y
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy