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x+y=36 x=36-y.① 4x+2y=100.② 吧①代入②得到: 4(36-y)+2y=100 144-4y+2y=100 144-100=4y-2y 44=2y y=22.③ 把③代入.①得到: x=36-22 =14 所以 x=14 y=22 不懂得歡迎追問.
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