问题 解答题

用简便方法计算下面各题.

(1)12.3-2.47-3.53

(2)212×7+188×7

(3)125×(4×8)×25

(4)101×63.

答案

(1)12.3-2.47-3.53

=12.3-(2.47+3.53)

=12.3-6

=6.3

(2)212×7+188×7

=(212+188)×7

=400×7

=2800

(3)125×(4×8)×25

=(125×8)×(25×4)

=1000×100

=100000

(4)101×63

=(100+1)×63

=100×63+1×63

=6300+63

=6363

单项选择题
单项选择题 A1/A2型题