计算:(1/2+1/4+1/6+1/8)−(1/3+1/6+1/9+1/12)+(1/4+1/8+1/12+1/16)−(1/5+1/10+1/15+1/20)=_.
计算:(
+
+
+
)−(
+
+
+
)+(
+
+
+
)−(
+
+
+
)=______.
1 |
2 |
1 |
4 |
1 |
6 |
1 |
8 |
1 |
3 |
1 |
6 |
1 |
9 |
1 |
12 |
1 |
4 |
1 |
8 |
1 |
12 |
1 |
16 |
1 |
5 |
1 |
10 |
1 |
15 |
1 |
20 |
数学人气:455 ℃时间:2019-08-18 14:29:50
优质解答
(12+24+18+116)-(13+16+19+112)+(14+18+112+116)+(15+110+115+120)=12×(1+12+13+14)−13×(1+12+13+14)+14×(1+12+13+14)−15×(1+12+13+14),=(1+12+13+14)×(12−13+14−15),=2512×1360,=65144....
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