15问答网 > {x+y=180 x⼀12+y⼀8=20}

{x+y=180 x⼀12+y⼀8=20}

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2025-02-09 06:26:01
推荐回答（1个）
回答1：

令x+y=180 为①；x/12+y/8=20为②；由①得x=180-y③；由②*24得2X+3y=480④；把③代入④得2（180-y）+3y=480；去括号，合并同类项得y=120；将y代入③得x=60。

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{x+y=180 x⼀12+y⼀8=20}
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