1. 係咪計除數先,跟住4捨5入
6.9減333除69 4.82 = 4.8
= 6.9減4.8
= 2.1
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209除48減4.1 4.35 = 4.4
= 4.4減4.1
= 0.3
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21加4540除231 19.65 = 19.7
= 21加19.7
= 40.7
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2. 乘除係咪不分先後,又係4捨5入
321乘21除23
= 6741除23 293.08 = 293.1
= 292.95 乘23 292.95 = 293
= 293.1
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計埋直式,唔該