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被減數—減數=差所以差+減數=被減數 這三個數的和是120,可以理解成兩個被減數為120. 那麼被減數就是60.差與減數之和也為60. 差是減數的3倍,把減數看做一份,那麼差就是3份,差+減數就是4份 60÷4=15 所以減數是15最後差是減數的3倍,差就是3×15=45
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