问题
解答题
计算:12.34+23.45+34.56+45.67+56.78+67.89+78.91+89.12+91.23.
答案
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.
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.