问题 解答题
14+15+16+17+18+19+20+211233+1266+34.
答案

(1)14+15+16+17+18+19+20+21,

=(14+21)+(15+20)+(16+19)+(17+18),

=35×4,

=140;

(2)1233+1266+34,

=1233+(1266+34),

=1233+1300,

=2533.

单项选择题 B1型题
判断题