9/14+2/5-1/7、脱式计算?
2个回答
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解:9/14+2/5-1/7等于( 9/10 ),【即等于0.9】
∵已知需求出9/14+2/5-1/7等于多少
∴9/14 + 2/5 - 1/7
= (9×5)/(14×5)+(2×14)/(5×14)-(1×10)/(7×10)
= 45/70 + 28/70 - 10/70
= 73/70 - 10/70
= (53-10)/70
= 63/70
= 9/10
= 0.9
答:9/14+2/5-1/7等于9/10,【即等于0.9】
∵已知需求出9/14+2/5-1/7等于多少
∴9/14 + 2/5 - 1/7
= (9×5)/(14×5)+(2×14)/(5×14)-(1×10)/(7×10)
= 45/70 + 28/70 - 10/70
= 73/70 - 10/70
= (53-10)/70
= 63/70
= 9/10
= 0.9
答:9/14+2/5-1/7等于9/10,【即等于0.9】
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