13乘99加135乘999加1357乘9999,等于多少?

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13乘99加135乘999加1357乘9999,等于多少?
13乘99加135乘999加1357乘9999,等于多少?

13乘99加135乘999加1357乘9999,等于多少?
原式=13×100-13+135×1000-135+1357×10000-1357
=1300+135000+13570000-1357-135-13
=13706300-1505
=13704795

(13*99)+(135*999)+(1357*9999)=13704795