问题 解答题

脱式计算.(能简算的要简算)

12.56-6.64-3.36

45.5-(0.98+5.5)13.6+7.94+6.4

15.19+3.36+4.64+4.81.

答案

(1)12.56-6.64-3.36,

=12.56-(6.64+3.36),

=12.56-10,

=2.56;

(2)45.5-(0.98+5.5),

=45.5-0.98-5.5,

=45.5-5.5-0.98,

=40-0.98,

=39.02;

(3)13.6+7.94+6.4,

=(13.6+6.4)+7.94,

=20+7.94,

=27.94;

(4)15.19+3.36+4.64+4.81,

=(15.19+4.81)+(3.36+4.64),

=20+8,

=28.

判断题
单项选择题