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{x-y=2,4(x-y)-y=5{4x-3y=11,2x+y=13
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{x-y=2,4(x-y)-y=5 {4x-3y=11,2x+y=13
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答案和解析
x-y=2 4x-4y=8
4(x-y)-y=5 4x-5y=5 y=3 x=5
4x-3y=11,
2x+y=13 4x+2y=26 5y=15 y=3 x=5
4(x-y)-y=5 4x-5y=5 y=3 x=5
4x-3y=11,
2x+y=13 4x+2y=26 5y=15 y=3 x=5
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