Calculate: 1 - 2 + 3 - 4 + 5-6 + 7-8 + 9-10
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2
Answer:
1 - 2 + 3 - 4 + 5-6 + 7-8 + 9-10
4 -6 +12-14 +9-10
16-20-1
16-21
-5
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0
1-2= 1+
3-4=1+
5-6=1+
7-8=1+
9-10=1+=5
3-4=1+
5-6=1+
7-8=1+
9-10=1+=5
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