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Anonymous
Anonymous asked in 教育與參考其他:教育 · 7 years ago

四則混合的逆算(一)

129÷□+17=60

156÷□+13=26

如何算??求解

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    129÷□+17=60

    -> 129÷□=60-17

    -> 129÷43=□=3

    156÷□+13=26

    -> 156÷□=26-13

    -> 156÷13=□=12

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