13.55+16.64-20.9怎么简便计算

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13.55+16.64-20.9怎么简便计算
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13.55+16.64-20.9怎么简便计算
13.55+16.64-20.9怎么简便计算

13.55+16.64-20.9怎么简便计算
13.55+16.64-20.9
=(13+16-20)+(0.55+0.64-0.9)
=9+0.24
=9.24

(13.55+16.45)-20.9+0.19
=30-20.9+0.19
=9.1+0.19
=9.29