0.85换成分数为85/100，化简为最简分数为17/20
17/20-1/4+1/5化成分母相同的分数为
17/20-5/20+4/20
=12/20+4/20
=16/20最后约分为4/5
0.85-1/4+1/5 =0.85-0.25-0.2=0.4
0.85-1/4+1/5等于多少?
过程:
0.85-1/4+1/5
=0.85-0.25+0.2
=0.8
解:0.85-1/4+1/5
=0.85-0.25+0.2
=0.85-(0.25-0.2)
=0.85-0.05
=0.8
0.85-1/4+1/5等于多少过程？
0.85-1/4+1/5
=0.85-0.25+0.2
=0.8
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