31.4X1.2怎么验算?
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解:31.4X1.2等于( 942/25 ),【即等于37.68】
∵已知需求出31.4X1.2等于多少
X × Y = Z,即X = Z ÷ Y
∴31.4 X 1.2
= (31×10+4)/10 × (1×10+2)/10
= 314/10 × 12/10
= 157/5 × 6/5
= (157×6)/(5×5)
= 942/25
= 37.68
经检验,31.4 = 37.68 ÷ 1.2符合题意
答:31.4X1.2等于942/25,【即等于37.68】
∵已知需求出31.4X1.2等于多少
X × Y = Z,即X = Z ÷ Y
∴31.4 X 1.2
= (31×10+4)/10 × (1×10+2)/10
= 314/10 × 12/10
= 157/5 × 6/5
= (157×6)/(5×5)
= 942/25
= 37.68
经检验,31.4 = 37.68 ÷ 1.2符合题意
答:31.4X1.2等于942/25,【即等于37.68】
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