1+2+3+4+5+6+7+8+9.+1000000的和乘3等于几?

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1+2+3+4+5+6+7+8+9.+1000000的和乘3等于几?
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1+2+3+4+5+6+7+8+9.+1000000的和乘3等于几?
1+2+3+4+5+6+7+8+9.+1000000的和乘3等于几?

1+2+3+4+5+6+7+8+9.+1000000的和乘3等于几?
=(1+1000000)*1000000\2*3
=1500001500000

1000000*1000001*3/2=1500001500000

=1500001500000

(1+1000000)×1000000÷2=500000500000
500000500000×3=1500001500000

1+1000000=1000001;2+999999=1000001;3+999998=1000001;………;500000+500001=1000001,一共有500000个1000001,所以最后所得的和为:1000001*500000*3=15000001500000

用公式:1+2+3+4+5+6+7+8+9.............+1000000=(1+1000000)*1000000/2=1500001500000
再乘以3等于4500004500000

求项数:(1000000-1)/1+1=1000000
求和:(1+1000000)*1000000*2=500000500000
求积:500000500000*3=1500001500000