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7/9×56+2/9×55,简算.
人气:143 ℃ 时间:2019-11-15 07:10:54
解答
7/9×56+2/9×55
=7/9×56+2/9×(56-1)
=7/9×56+2/9×56-2/9
=(7/9+2/9)x56-2/9
=56-2/9
=55又 7/9
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