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问题: jiandan

jian bian ji cuan
0.375+7/15-1/15+5/8

0.68+1/9+8/25

6.45+17/29+11/20

解答:

0.375+7/15-1/15+5/8
=3/8+7/15-1/15+5/8
=1+2/5
=7/5

0.68+1/9+8/25
17/25+8/25+1/9
=1+1/9
=10/9

6.45+17/29+11/20
=129/20+11/20+17/29
=7+17/29
=220/29