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x+y=20 x-y=16

分类: 作业答案 • 2022-05-30 08:39:17

问题描述：

x+y=20 x-y=16

答

x+y=20 (1)
x-y=16 (2)
(1)+(2)
2x=36
x=18
y=20-x=20-18=2

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x+y=20 x-y=16

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