1+2+3+4+5+6+7+...+999999999+1000000000=?(简便计算)

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1+2+3+4+5+6+7+...+999999999+1000000000=?(简便计算)1+2+3+4+5+6+7+...+999999999+1000000000=?(简便计算)1+2+3+4+

1+2+3+4+5+6+7+...+999999999+1000000000=?(简便计算)
1+2+3+4+5+6+7+...+999999999+1000000000=?(简便计算)

1+2+3+4+5+6+7+...+999999999+1000000000=?(简便计算)
1+2+3+4+5+6+7+...+999999999+1000000000=1000000000*(1+1000000000)/2

1加999999999 然后逐一加 最后加上1000000000

1+2+3+4+5+6+7+...+999999999+1000000000=(1+1000000000)×1000000000÷2

1+2+3+4+5+6+7+...+999999999+1000000000
=1/2X1000000000X(1+1000000000)
=500000000500000000

(1+1000000000)+(2+999999999)+......+(500000000+500000001)=500000000500000000

1+2+3+4+5+6+7+...+999999999+1000000000
=(1+1000000000)*1000000000/2
=500000000500000000
再给你种简便方法:口决: 五加 5前5后少一零
1+2...10=55
1....100=5050
1...1000=500500
1.....10000=50005000
1...1000000000=500000000500000000

1+999999999=1000000000;
2+999999998=1000000000;
3+999999997=1000000000;
>>>>
5000000000+1000000000*4999999999