几个1/7是18/42？
展开全部
解：（ 3 ）个1/7是18/42
∵已知需求出几个1/7是18/42
1个1/7 = 1 × 1/7 = 1/7
2个1/7 = 1/7 + 1/7 = 2 × 1/7 = 2/7
∴设x个1/7是18/42
x × 1/7 = 18/42
（1/7）x = 3/7
x = 3/7 ÷ 1/7
x = 3/7 × 7
∴x = 3
答：3个1/7是18/42
∵已知需求出几个1/7是18/42
1个1/7 = 1 × 1/7 = 1/7
2个1/7 = 1/7 + 1/7 = 2 × 1/7 = 2/7
∴设x个1/7是18/42
x × 1/7 = 18/42
（1/7）x = 3/7
x = 3/7 ÷ 1/7
x = 3/7 × 7
∴x = 3
答：3个1/7是18/42
已赞过
已踩过<
评论
收起
你对这个回答的评价是？
推荐律师服务：
若未解决您的问题，请您详细描述您的问题，通过百度律临进行免费专业咨询
