问题 解答题

能简算的要简算

0.4×(0.25+2.5)

3.3×2.8+5.7×2.8+2.8

12.5×2.5×4×8

2.05÷0.82+33.6.

答案

(1)0.4×(0.25+2.5)

=0.4×0.25+0.4×2.5

=0.1+1

=1.1;

(2)3.3×2.8+5.7×2.8+2.8

=(3.3+5.7+1)×2.8

=10×2.8

=28;

(3)12.5×2.5×4×8

=(12.5×8)×(2.5×4)

=100×10

=1000;

(4)2.05÷0.82+33.6

=2.5+33.6

=36.1.

单项选择题
单项选择题