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简算1/7+3/5+2/5+5/7 3/4+6/13+7/13-1/4
简算1/7+3/5+2/5+5/7 3/4+6/13+7/13-1/4
人气:396 ℃ 时间:2020-06-11 02:15:55
解答
1/7+3/5+2/5+5/7
=1/7+5/7+3/5+2/5
=6/7+1
=1又6/7
3/4+6/13+7/13-1/4
=3/4-1/4+6/13+7/13
=1/2+1
=1又1/2
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