-2xy·【x²-3y²】-4xy【2x²+y²】=【】【过程】
3y/2x+2y + 2xy/x²+xy等于多少过程
分式除法(2y-x)÷x²-4xy+4y²/x+3xy要过程
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
X²+2xy+y²/xy乘x²-2xy+y²/xy+y²=
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
已知x/y=3,求(x²+2xy-3xy²)/(x²-xy+y²)
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,