x+y=8 2x-y=1 求3x+5y
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x+y=8 2x-y=1 求3x+5y
x+y=8 2x-y=1 求3x+5y
x+y=8 2x-y=1 求3x+5y
X=3,y=5,3x十5y=34
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x+y=8 2x-y=1 求3x+5y
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