21+22+23+24……+100简算

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21+22+23+24……+100简算
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21+22+23+24……+100简算
21+22+23+24……+100简算

21+22+23+24……+100简算
21+22+23+24……+100
=(21+100)*80/2
=121*40
=4840

(21+100)*80/2=4840

(100-21)÷1+1=80
(21+100)×80÷2=4840

21+22+23+24……+100
=(1+100)x100÷2-(1+20)x20÷2
=5050-210
=4840

(21+100)乘以(100-21+1)除以2

121X40=4840
注:100和21,22和99,23和98……59和62,60和61,和均为121,共40对这样的加和,故是121X40=4840

=(21+100)*80/2=121*40=4840. 21+100=22+99=23+98……头尾相加,80/2对