已知{3x+2y=3 2x+3y=7 ,则x+y= ,x-y=
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已知{3x+2y=3 2x+3y=7 ,则x+y= ,x-y=
3x+2y=3
2x+3y=7
5x+5y=10
x+y=2
3x-2x+2y-3y=3-7
x-y=-4
2x+3y=7
5x+5y=10
x+y=2
3x-2x+2y-3y=3-7
x-y=-4
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已知{3x+2y=3 2x+3y=7 ,则x+y= ,x-y=
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