|—6.25|+|+2.7| |—8又3分之1|—|—3又3分之2|+|—20|
人气:218 ℃ 时间:2020-04-04 12:01:56
解答
|—6.25|+|+2.7|
=6.25+2.7
=8.95
|—8又3分之1|—|—3又3分之2|+|—20|
=8又1/3-3又2/3+20
=24又2/3
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