1.01+1.11+2.01+2.11+3.01+3.11+4.01+4.11+6.09+6.99+7.09+7.99+8.09+8.99+9.09+9.99=( )。

admin2020-05-27  3

问题 1.01+1.11+2.01+2.11+3.01+3.11+4.01+4.11+6.09+6.99+7.09+7.99+8.09+8.99+9.09+9.99=(       )。

选项 A、64.6
B、80
C、50
D、84.8

答案D

解析 原式=(1.01+9.99)+(1.11+9.09)+(2.01+8.99)+(2.11+8.09)+(3.01+7.99)+(3.11+7.09)+(4.01+6.99)+(4.11+6.09)=11×4+10.2×4=84.8。
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