cherry2blossom
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  • 02-10-2018
  • Mathematics
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Integer questions. Thank you!

Integer questions Thank you class=

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quynhgiao911516nan quynhgiao911516nan
  • 03-10-2018
3. We can see that
1+100=101
2+99=101
3+98=101
.................
and so on
From 1 to 100, there are 50 pairs that has the sum is 101
Z=101×50=5050
4. We can see that
1-2=-1
3-4=-1
5-6=-1
...........
and so on
There are 10 pairs that has sum is -1
Z= 10×(-1)=-10
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