已知X+Y=-5 XY=3扯X^2+Y^2=?
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已知X+Y=-5XY=3扯X^2+Y^2=?已知X+Y=-5XY=3扯X^2+Y^2=?已知X+Y=-5XY=3扯X^2+Y^2=?X+Y=-5XY=3X^2+Y^2=(X+Y)^2-2XY=(-5)
已知X+Y=-5 XY=3扯X^2+Y^2=?
已知X+Y=-5 XY=3扯X^2+Y^2=?
已知X+Y=-5 XY=3扯X^2+Y^2=?
X+Y=-5
XY=3
X^2+Y^2=(X+Y)^2-2XY=(-5)^2-2*3=19
因为x^2+Y^2=(x+y)^2-2xy=25-6=19
(x+Y)^2=X^2+Y^2+2XY=25
X^2+Y^2=(X+Y)^2-2XY=25-6=19
19
X^2是 X的平方吗?如果是X^2+Y^2=19
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