(41.7+19.6+23.85)+(10.4+26.15)怎么简便

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(41.7+19.6+23.85)+(10.4+26.15)怎么简便

(41.7+19.6+23.85)+(10.4+26.15)怎么简便
(41.7+19.6+23.85)+(10.4+26.15)怎么简便

(41.7+19.6+23.85)+(10.4+26.15)怎么简便
(41.7+19.6+23.85)+(10.4+26.15)
=41.7+19.6+23.85+10.4+26.15
=41.7+(19.6+10.4)+(23.85+26.15)
=41.7+30+50
=121.7