已知x+y=-3,xy=1,则(x-y)^2=?
2个回答
(X-Y)²=X²-2XY+Y²=(X+Y)²-4XY=9-4=5
这不是难题,是基础题,
相关问题
已知1/x-1/y=-3,则x+3xy-y/3x-2xy-3y=
已知1/x=1/y=6,则3x-2xy+3y/3xy+x+y=?
已知1/x-1/y=5,则2x+3xy-2y/y+2xy-x
已知x-y=3xy,则[2x+3xy−2y/x−2xy−y]=______.
1.已知x-y=-3,则(x²+y²)/2-xy= ( )
已知(x+y)²=3,(x-y)²=,则[(xy+2)(xy-2)-2x²y²+
已知x-y=3,xy=1,则x2+y2= ___ .
已知分式1/x-1/2y=1/3,则2x+3xy-4y/x-3xy-2y=
已知x+y=5,xy=-1,则(3x-4y+2xy)-(2x-5y+5xy)=_______
已知x÷y=3,则x²+2xy-3y²÷(x²-xy+y²)=?