27/5-[(-2+17/5)-(46/15-18 - 知识问答

27/5-[(-2+17/5)-(46/15-18/5)]由于是分数形式的打不出来所以看着有点别扭

1个回答

27/5-[(-2+17/5)-(46/15-18/5)]
=27/5-[(17/5-10/5)-(46/15-54/15)]
=27/5-[7/5-(-8/15)]
=27/5-(7/5+8/15)
=27/5-7/5-8/15
=4-8/15
=52/15
=3又7/15
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