0.625*(一又三分之二+三又六分之一)+1/6/一又五分之三-5/8

问题描述:

0.625*(一又三分之二+三又六分之一)+1/6/一又五分之三-5/8
0.625*(一又三分之二+三又六分之一)+1/6/一又五分之三-5/8

=0.625*(5/3+19/6)+1/6 / 8/5-5/8
=5/8*29/6+1/6 *5/8-5/8
=145/48+5/48-5/8
=150/48-5/8
=25/8-5/8
=20/8
=5/2=2.5