1乘105+2乘105+3乘105..+到100,用简式计算答案.

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1乘105+2乘105+3乘105..+到100,用简式计算答案.

1乘105+2乘105+3乘105..+到100,用简式计算答案.
1乘105+2乘105+3乘105..+到100,用简式计算答案.

1乘105+2乘105+3乘105..+到100,用简式计算答案.
1+2+3...+100=50*(101)=5050
5050*105=530250

(1+2+3+4+...+100)*105=

=(1+2+3+……+100)*105
=101*50*105
=5050*105=530250

??
=(1+2+3=...+99+100)*105
=5050*105
=530250

(1+2+...+100)乘105
=(1+99+2+98+3+97...)乘105
=5050乘105
=530250

1乘105+2乘105+3乘105……+到100
=(1+2+3+……+100)×105
=(1+100)×(100÷2)×105
=101×50×105
=5050×(100+5)
=5050×100+5050×5
=505000+25250
=530250

1+2+3+.....+100=(1+100)*100/2
是首数加尾数乘以位数除以2
所以你的答案是:
(1+100)*100/2*105=101*50*105=530250

(1+2+3+......+100)*105=530250