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计算:1-3+6-10+15-21+28-…+4950.

2019-04-22

计算:1-3+6-10+15-21+28-…+4950.
优质解答
1-3+6-10+15-21+28-…+4950
=1-(1+2)+(1+2+3)-(1+2+3+4)+…+(1+2+3+…+99)
=1+3+5+…+99
=(1+99)×50÷2
=2500
1-3+6-10+15-21+28-…+4950
=1-(1+2)+(1+2+3)-(1+2+3+4)+…+(1+2+3+…+99)
=1+3+5+…+99
=(1+99)×50÷2
=2500
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