(1+1·1)+(2+1·1x2)+(3+1·1x3)+…+(10+1·1x10)简算

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(1+1·1)+(2+1·1x2)+(3+1·1x3)+…+(10+1·1x10)简算
(1+1·1)+(2+1·1x2)+(3+1·1x3)+…+(10+1·1x10)简算

(1+1·1)+(2+1·1x2)+(3+1·1x3)+…+(10+1·1x10)简算
1+2+3+4.+10+[1.1X(1+2+3+4.+10)]
=55+1.1X55
=55+60.5
=115.5

8

(1+2+3……+10)+(1+2+3……+10)*1.1=55+55*1.1=55+60.5=115.5