问题 解答题
用简便方法计算.
3.4×0.46+3.4×0.54[18.95-﹙8.43+3.87﹚]×2.
答案

①3.4×0.46+3.4×0.54,

=3.4×(0.46+0.54),

=3.4×1,

=3.4;

②[18.95-﹙8.43+3.87﹚]×2,

=[18.95-12.3]×2,

=18.95×2-12.3×2,

=37.9-24.6,

=13.3.

单项选择题
单项选择题