若实数X,Y同时满足3x+2y=7和2x+3y=3,求x+y/x-y
4个回答
3X+2Y=7.@
2X+3Y=3.#
将@式与#式相加得:
5X+5Y=10,即X+Y=2
将@式减去#式,得:
X-Y=4
因此,X+Y/X-Y=1/2
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