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(87.65-19.36)-(47.15+11.64) (能简算的要简算)
人气:496 ℃ 时间:2020-03-30 20:12:41
解答
(87.65-19.36)-(47.15+11.64)
=87.65-19.36-47.15-11.64
=(87.65-47.15)-(19.36+11.64)
=40.5-31
=9.5
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