问题 解答题

简算

31.6×2.5-2.4×31.6

13.7×6.5+4.5×13.7-13.7

8.76×10.1.

答案

(1)31.6×2.5-2.4×31.6,

=31.6×(2.5-2.4),

=31.6×0.1,

=3.16;

(2)13.7×6.5+4.5×13.7-13.7,

=13.7×(6.5+4.5-1),

=13.7×10,

=137;

(3)8.76×10.1,

=8.76×(10+0.1),

=8.76×10+8.76×0.1,

=87.6+0.876,

=88.476

单项选择题 B1型题
单项选择题 B1型题