125+126+127+128+.+221+222+223=?
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125+126+127+128+.+221+222+223=?
125+126+127+128+.+221+222+223=?
125+126+127+128+.+221+222+223=?
125+126+127+128+.+221+222+223=
(125+223)×(223-125+1)÷2
=348×99÷2
=17226
1566
(125+223)(223-125+1)/2=17226
=(223-125+1)*(125+223)/2=99*348/2=17226
int sum=0;
for(int i=125;i<=233;i++)
{
sum+=i;
}
Console.Write("{0}",sum);
运行结果:
17226
125+126+127+128+.........+221+222+223=
(125+223)+(126+222)+(127+221)+........+(173+175)+174 =348×49+174=17226
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125+126+127+128+.+221+222+223=?
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