3题4题5题计算
1个回答
2014-10-02
展开全部
3)
17.75-6.25+8.5-0.75-22.25
=17.75-0.75+8.5-6.25-22.25
=17+8-28
=25-28
-3
4)
49-23.75+18.7-25.25
=49+18.7-(25.25+23.75)
=18.7+49-49
=18.7
5)
1/4+3 3/4+3 3/4-3 1/4+11 2/3+1/2
=6 6/4+2/4+11 2/3-3
=8-3+11 2/3
=16 2/3
17.75-6.25+8.5-0.75-22.25
=17.75-0.75+8.5-6.25-22.25
=17+8-28
=25-28
-3
4)
49-23.75+18.7-25.25
=49+18.7-(25.25+23.75)
=18.7+49-49
=18.7
5)
1/4+3 3/4+3 3/4-3 1/4+11 2/3+1/2
=6 6/4+2/4+11 2/3-3
=8-3+11 2/3
=16 2/3
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