x、y为有理数,且|x-1|+2(y+3)2=0,求x2-3xy+2y2的值.
x、y为有理数,且|x-1|+2(y+3)2=0,求x2-3xy+2y2的值.
已知x2-2xy=3y2且x,y为非零实数 求:(1)2x+y/x-2y (2)2x2-3y2+5xy/x2+xy+y2
x(x-1)-(x2-y)=-3,求x2+y2-2xy的值
已知2x=3y,求xy/(x2+y2)-y2/(x2-y2)的值
x(x-1)-(x2-y)=-3,求x2-y2-2xy的值
已知x(x-1)-(x2-y)=-3,求x2+y2-2xy的值
已知x、y是有理数,且|3x-4|+(5y+7)2=0,求x2+y2的值.
X2-4XY+3Y2=0(跟在字母后面的2是平方),且XY不等于零,求X/Y+Y/X的值
已知xy不等于0,且3x2-2xy-8y2=0,求x/y的值?
已知2x2+5xy-3y2=0且xy不等于0,求x:y的值
已知x(x-1)-(x2-y)=-3,求x2+y2-2xy的值.
设x、y为实数,且x2+xy+y2=3,求x2-xy+y2的最大值和最小值.