原式=241×345÷678÷345×(678÷241)
=241×345÷678÷345×678÷241
=241÷241×345÷345×678÷678=1
速算巧算241×345÷678÷345×(678÷241)
速算巧算241×345÷678÷345×(678÷241)
数学人气:484 ℃时间:2020-04-19 05:19:05
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