3x²-xy-4xy²-3x+4y=0怎么做
3x²-xy-4xy²-3x+4y=0怎么做
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
-3(xy-2x²)-[y²-(5xy-4x²)+2xy]
已知x²-3xy+4x=3,y²+xy-4y+7=0,则xy-1/2(x²+y²
3x+4y=0 x不等于0 求分式2xy+y²/x²-xy
(-3x^y+2xy)-( )=4x^+xy
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
化简并求值 xy-2{xy-[3x²y-(xy²+0.5xy)]+4x²y},其中x=1,
化简4xy-3y²-3x²+xy-3xy-2x²+x²-2y²
已知x-y=4xy,则2x+3xy-2yx-2xy-y
计算 2xy[4x²y²-3y(xy+x²y)-xy²]