问题 解答题

用简便方法计算下面各题.

43.6+9.8+6.4;7.3×0.25×8;2.31×1.5+1.5×7.69.

答案

①43.6+9.8+6.4

=(43.6+6.4)+9.8

=50+9.8

=59.8;

②7.3×0.25×8

=7.3×(0.25×8)

=7.3×2

=14.6;

③2.31×1.5+1.5×7.69

=(2.31+7.69)×1.5

=10×1.5

=15.

单项选择题
问答题 简答题