2.79-2.79×0.99的简便运算怎么算?
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解:2.79-2.79×0.99等于( 279/10000 ),【即等于0.0279】
∵已知需求出2.79-2.79×0.99等于多少
A - A × B = A × (1 - B)
∴2.79 - 2.79 × 0.99
= 2.79 × (1 - 0.99)
= (2×100+79)/100 × (100/100 - 99/100)
= 279/100 × 1/100
= 279/10000
= 0.0279
答:2.79-2.79×0.99等于279/10000,【即等于0.0279】
∵已知需求出2.79-2.79×0.99等于多少
A - A × B = A × (1 - B)
∴2.79 - 2.79 × 0.99
= 2.79 × (1 - 0.99)
= (2×100+79)/100 × (100/100 - 99/100)
= 279/100 × 1/100
= 279/10000
= 0.0279
答:2.79-2.79×0.99等于279/10000,【即等于0.0279】
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