计算:12.34+23.45+34.56+45.67+56.78+67.89+78.91+89.12+91.23.

问题描述:

计算:12.34+23.45+34.56+45.67+56.78+67.89+78.91+89.12+91.23.

12.34+23.45+34.56+45.67+56.78+67.89+78.91+89.12+91.23
=11.11×(1+2+…+8+9),
=11.11×45,
=499.95.