分数数学简便运算:4/5× 2/3+ 1/5÷ 3/4=? 1/4× 5/7+ 1/4÷7/2+ 1/4=?
4个回答
展开全部
4/5×2/3+1/5÷3/4
=4/5×2/3+1/5×4/3
=4/5×(2/3+1/3)
=4/5
1/4×5/7+1/4÷7/2+1/4
=1/4×5/7+1/4×2/7+1/4
=1/4×(5/7+2/7+1)
=1/4×2
=1/2
=4/5×2/3+1/5×4/3
=4/5×(2/3+1/3)
=4/5
1/4×5/7+1/4÷7/2+1/4
=1/4×5/7+1/4×2/7+1/4
=1/4×(5/7+2/7+1)
=1/4×2
=1/2
本回答被提问者采纳
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
展开全部
4/5× 2/3+ 1/5÷ 3/4
=4/5×2/3+1/5×4/3
=4/5×2/3+4/5×1/3
=4/5×(2/3+1/3)
=4/5
1/4× 5/7+ 1/4÷7/2+ 1/4
=1/4×5/7+1/4×2/7+1/4
=1/4×(5/7+2/7+1)
=1/4×1
=1/4
=4/5×2/3+1/5×4/3
=4/5×2/3+4/5×1/3
=4/5×(2/3+1/3)
=4/5
1/4× 5/7+ 1/4÷7/2+ 1/4
=1/4×5/7+1/4×2/7+1/4
=1/4×(5/7+2/7+1)
=1/4×1
=1/4
追问
(5/7+2/7+1)
你加1了么。。
追答
4/5× 2/3+ 1/5÷ 3/4
=4/5×2/3+1/5×4/3
=4/5×2/3+4/5×1/3
=4/5×(2/3+1/3)
=4/5
1/4× 5/7+ 1/4÷7/2+ 1/4
=1/4×5/7+1/4×2/7+1/4
=1/4×(5/7+2/7+1)
=1/4×2
=1/2
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
展开全部
4/5× 2/3+ 1/5÷ 3/4
=4/5× 2/3+ 1/5× 4/3
=8/15+4/15
=12/15
1/4× 5/7+ 1/4÷7/2+ 1/4
=1/4× 5/7+ 1/4×2/7+ 1/4
=5/28+2/28+1/4
=(5+2+7)/28
=14/28
=1/2
=4/5× 2/3+ 1/5× 4/3
=8/15+4/15
=12/15
1/4× 5/7+ 1/4÷7/2+ 1/4
=1/4× 5/7+ 1/4×2/7+ 1/4
=5/28+2/28+1/4
=(5+2+7)/28
=14/28
=1/2
已赞过
已踩过<
评论
收起
你对这个回答的评价是?
展开全部
8/15+4/15=12/15=4/5
5/28+2/28=7/28=1/4
5/28+2/28=7/28=1/4
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