用簡便方法計算下列分數題
- 2022-06-05
解:1/2+(-1/6)+(-1/12)+(-1/20)+(-1/30)+(-1/42)
=1/2-[(1/2)-(1/3)]-[(1/3)-(1/4)]-[(1/4)-(1/5)]-[(1/5)-(1/6)]-[(1/6)-(1/7)]
=1/2-1/2+1/3-1/3+1/4-1/4+1/5-1/5+1/6-1/6+1/7
=1/7
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解:1/2+(-1/6)+(-1/12)+(-1/20)+(-1/30)+(-1/42)
=1/2-[(1/2)-(1/3)]-[(1/3)-(1/4)]-[(1/4)-(1/5)]-[(1/5)-(1/6)]-[(1/6)-(1/7)]
=1/2-1/2+1/3-1/3+1/4-1/4+1/5-1/5+1/6-1/6+1/7
=1/7
滿意請採納,多加好評,不懂請追問
上一篇:杜賓前腿黑色部分到爪子了是不純嗎
下一篇:急性咽炎引起頭痛