1/2 + 1/6 + 1/12 +1/20 + 1/30 +1/42等于多少,
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![1/2 + 1/6 + 1/12 +1/20 + 1/30 +1/42等于多少,](/uploads/image/z/100349-53-9.jpg?t=1%2F2+%2B+1%2F6+%2B+1%2F12+%2B1%2F20+%2B+1%2F30+%2B1%2F42%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%2C)
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1/2 + 1/6 + 1/12 +1/20 + 1/30 +1/42等于多少,
1/2 + 1/6 + 1/12 +1/20 + 1/30 +1/42等于多少,
1/2 + 1/6 + 1/12 +1/20 + 1/30 +1/42等于多少,
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+(1/5-1/6)+(1/6-1/7)
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7
=1-1/7
=6/7
答案为:
6/7
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110=(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/9-1/10)+(1/10-1/11)=1-1/11=10/11...
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1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110=(1-1/2)+(1/2-1/3)+(1/3-1/4)+...+(1/9-1/10)+(1/10-1/11)=1-1/11=10/11
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1/2+1/6+1/12+1/20.+1/380
2%1+6%1+12%1+20%1+30%1
1/2+1/6+1/12+1/20+1/30
1/2-1/6-1/12-1/20-...-1/110
1/2,-1/6,1/12,-1/20,1/30
2/1+6/1+12/1+24/1+48/1
1/2+1/6+1/12+1/20+.1/90
2/1+6/1+12/1+20/1+...+2450/1
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
1+1/2+1/12+1/6+1/20+1/30+1/40+1/56
(1-1/2)+(1-1/6)+(1-1/12)+...+(1-1/110)=?
1/2+1/6+1/12+...+1/4054182 等于多少?
1/2+1/6+1/12+...+1/56=快
1/2+1/6+1/12+1/20=
1/2+1/6+1/12+.1/9900
1/2+1/6+1/12+.+1/9900
1/2+1/6+1/12+...+1/72简便运算