(-1/2)+(-2/5)+(+3/2)+(18/5)+(39/5)怎么简算
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(-1/2)+(-2/5)+(+3/2)+(18/5)+(39/5)怎么简算
(-1/2)+(-2/5)+(+3/2)+(18/5)+(39/5)
=(-1/2+3/2)+(-2/5+18/5+39/5)
=2/2+55/5
=1+11
=12
=(-1/2+3/2)+(-2/5+18/5+39/5)
=2/2+55/5
=1+11
=12