1/2+1/6+1/12+1/20+1/30等于多少,不能用通分
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![1/2+1/6+1/12+1/20+1/30等于多少,不能用通分](/uploads/image/z/2754294-6-4.jpg?t=1%2F2%2B1%2F6%2B1%2F12%2B1%2F20%2B1%2F30%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%2C%E4%B8%8D%E8%83%BD%E7%94%A8%E9%80%9A%E5%88%86)
1/2+1/6+1/12+1/20+1/30等于多少,不能用通分
1/2+1/6+1/12+1/20+1/30等于多少,不能用通分
1/2+1/6+1/12+1/20+1/30等于多少,不能用通分
1/2=1-1/2
1/6=1/2-1/3
1/12=1/3-1/4
1/20=1/4-1/5
1/30=1/5-1/6
把所有等式相加即得1/2+1/6+1/12+1/20+1/30=1-1/6=5/6
1/2+1/6+1/12+1/20+1/30
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6
=1-1/6
=5/6