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3又3/5X(0.25+1又1/15)/2.4

分类: 作业答案 • 2022-07-28 10:32:53
问题描述：

3又3/5X(0.25+1又1/15)/2.4

答

3又3/5X(0.25+1又1/15)/2.4
={18/5(1/4+16/15)}/2.4
={18/5*79/60}/(12/5)
18*79*5
= ---------
5* 60*12
79
= ----
40
39
= 1-----
40
= 1.975

答

7.9

答

3又3/5*(0.25+1又1/15)/2.4
=18/5*[5(1/4 + 16/15)]/12
=[3(1/4 + 16/15)]/2
=[3(15/60 + 64/60)]/2
=15/10 + 64/10
=7.9

答

3又3/5X(0.25+1又1/15)/2.4
={18/5(1/4+16/15)}/2.4
={18/5*79/60}/(12/5)
=19/10

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