若x-y=3,x2 +y2=29,求xy如题,
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若2分之x=3分之y,求x2-6xy-7y2分之x2-2xy-3y2
若x/y=2,求x2-2xy-3y2/x2-6xy-7y2的值
若x-y=3,x2 +y2=29,求xy如题,
若X2+Y2-2X-6Y+10=0 ,求(x2-y2)/xy的值
x+y=3,xy=-5,x2+y2=19,x2-xy+y2=24,求x-y
当x+y=-3,求(2x2+xy+3y2)-(x2-xy+2y2)的值,速求!
x2-2xy-3y2=0,其中x,y均不为零,求(y-x)/x2-xy/2x-y-y2/xy-x
已知X/Y=2/7, 求X2-3XY+2Y2/2X2-3XY+7Y2的值
已知x/y=2/7,求分式(x2-3xy+2y2)/(x2-2xy+y2)的值
已知x/y=2/7,求分式x2-3xy+2y2/x2-2xy+y2的值
已知x/y=3/5,求 (x2-xy+2y2)/(x2+2xy-y2)的值
若x(x-1)-(x2-y)=7,求二分之一x2+y2-xy的值
x(x-1)-(x2-y)=-3,求x2+y2-2xy的值
若X2-3xy+2y2=0,求y/x的值
若X2-3xy+2y2=0,求y/x的值
已知实数x,y满足x2+xy+y2=3,则x2-xy+y2的最小值
已知:x2-y2=16,x+y=2,求:3x-3y/y2-x2+x2-2xy+y2/x2-y2-x2-x-6/x+2除以(x+y)
若x/y=2,求x2-2xy-3y2/x2-6xy-7y2的值这是一道十字相乘法的计算题!