（九分之二＋九分之三）×五分之九用简便方法计算
人气：490 ℃ 时间：2019-08-17 22:50:39
解答
lzjpxr,
（2/9＋3/9）×9/5
＝2/9×9/5＋3/9×9/5
＝2/5＋3/5
＝1
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