已知x+y=-3,xy=1,则(x-y)^2=?
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已知x+y=-3,xy=1,则(x-y)^2=?已知x+y=-3,xy=1,则(x-y)^2=?已知x+y=-3,xy=1,则(x-y)^2=?(X-Y)²=X²-2XY+Y&su
已知x+y=-3,xy=1,则(x-y)^2=?
已知x+y=-3,xy=1,则(x-y)^2=?
已知x+y=-3,xy=1,则(x-y)^2=?
(X-Y)²=X²-2XY+Y²=(X+Y)²-4XY=9-4=5
这不是难题,是基础题,
(x+y)^2=x^2+y^2+2xy=(-3)^2=9
xy=1
x^2+y^2=9-2xy=9-2=7
(x-y)^2==x^2+y^2-2xy=7-2=5
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