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4/7 × 5/9 + 3/7 × 5/9 简算,
人气:298 ℃ 时间:2020-02-06 02:59:09
解答
4/7 × 5/9 + 3/7 × 5/9
=(4/7+3/7)x5/9
=1x5/9
=5/9
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