9.07-22.78/3.4要简便 (455-12.5*4)/8.1要简便

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9.07-22.78/3.4要简便 (455-12.5*4)/8.1要简便
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9.07-22.78/3.4要简便 (455-12.5*4)/8.1要简便
9.07-22.78/3.4要简便 (455-12.5*4)/8.1要简便

9.07-22.78/3.4要简便 (455-12.5*4)/8.1要简便
9.07-22.78/3.4
=9.07-113.9/17
=9.07-6.7
=2.37
(455-12.5*4)/8.1
=(455-50)/8.1
=405/9/0.9
=45/0.9
=50