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一道简便运算,7/12-9/20+11/30-13/42+15/56=====
题目详情
一道简便运算,
7/12-9/20+11/30-13/42+15/56
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7/12-9/20+11/30-13/42+15/56
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▼优质解答
答案和解析
7/12-9/20+11/30-13/42+15/56
=1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7+1/7+1/8
=1/3+1/8
=11/24
=1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7+1/7+1/8
=1/3+1/8
=11/24
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