x=3,y=-1/3,求3x05[2xy²-2(xy-3/2x²y)]要过程.
已知x+y=12,xy=9,求x05y+2xy05分之x05+3xy+2y平方
已知x:y=3:2,求(x²+3xy)/(xy+2xy)
若x=1/2,y=1 求x(x²+xy+y²)-y(x²+xy+y²)+3xy(
已知x/y=3,求(x²+2xy-3xy²)/(x²-xy+y²)
1/x+1/y=5,求2x-3xy+2y/x²+xy+y的值
已知(x+1)²+|y-1|=0,求2(xy-5xy²)-(3xy²-xy)得值
已知x+y=3 xy=-5 求x设abc=1 求x²+3xy+2y²/x²y+2xy
已知3/(x-y)=1/xy 求(-x-2xy+y)/ (2x+3xy-2y)
已知2X-3√xy-2y=0(x>0)求2x²+xy-9y²分之x²+4xy-16y
已知:x-y=1,xy=-2.求:(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
x-y=1,xy=2.求:(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值
若x-y=4,xy=1,求(-2xy+2x+3y)-(3xy+2y-2x)-(x+4y+xy)的值