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.
答
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.