2.5×0.39ⅹ2.4的简便运算?
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解:2.5×0.39ⅹ2.4等于( 117/50 ) ,【即等于2.34】
∵已知需求出2.5×0.39ⅹ2.4等于多少
∴2.5×0.39ⅹ2.4
= 2.5 × 0.39 × (0.8 × 3)
= 2.5 × 0.39 × 0.8 × 3
= (2.5 × 0.8)× (0.39 × 3)
= 2 × (39/100 × 3)
= 2 × 117/100
= 234/100
= 117/50
= 2.34
答:2.5×0.39ⅹ2.4等于117/50,【即等于2.34】
∵已知需求出2.5×0.39ⅹ2.4等于多少
∴2.5×0.39ⅹ2.4
= 2.5 × 0.39 × (0.8 × 3)
= 2.5 × 0.39 × 0.8 × 3
= (2.5 × 0.8)× (0.39 × 3)
= 2 × (39/100 × 3)
= 2 × 117/100
= 234/100
= 117/50
= 2.34
答:2.5×0.39ⅹ2.4等于117/50,【即等于2.34】
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