解:2.8乘以0.81除以0.9等于( 63/25 ),【即等于2.52】
∵已知需求出2.8乘以0.81除以0.9等于多少
∴2.8乘以0.81除以0.9
= 2.8 × 0.81 ÷ 0.9
= (2×10+8)/10 × 81/100 ÷ 9/10
= 28/10 × 81/100 × 10/9
= 14/5 × (81/100 × 10/9)
= 14/5 × 9/10
= (7×2)/5 × 9/(5×2)
= 63/25
= 2.52
答:2.8乘以0.81除以0.9等于63/25,【即等于2.52】
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