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1/2-1/6-1/12-1/20-1/30-1/42=?是6/7还是1/7
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1/2-1/6-1/12-1/20-1/30-1/42=?是6/7 还是1/7
▼优质解答
答案和解析
1/2-1/6-1/12-1/20-1/30-1/42
=2/6-1/12-1/20-1/30-1/42
=1/4-1/20-1/30-1/42
=1/5-1/30-1/42
=1/6-1/42
=6/42
=1/7
=2/6-1/12-1/20-1/30-1/42
=1/4-1/20-1/30-1/42
=1/5-1/30-1/42
=1/6-1/42
=6/42
=1/7
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