问题 解答题

(1)4.97×5.98+4.97×4.02

(2)43.89-8.64-3.89.

答案

(1)4.97×5.98+4.97×4.02

=4.97×(5.98+4.02)

=4.97×10

=49.7;

(2)43.89-8.64-3.89

=(43.89-3.89)-8.64

=40-8.64

=31.36.

单项选择题
名词解释