X+Y=6 X²-Y²=48 Y-X=?
6个回答
X+Y=6 X²-Y²=48 Y-X=?
X²-Y²=(X+Y)(X-Y)=6(X-Y)=48
所以:X-Y=8,则Y-X=-8.
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x+y等于6 x的平方方-y的平方等于48 求x y的值