问题 解答题

用简便方法计算.

4.35+8.68+15.65+1.32

19.32-5.56-3.44+0.68

37.62-(7.62+3.25)

5.49+2.68-3.49+6.32.

答案

①4.35+8.68+15.65+1.32

=(3.45+15.65)+(8.68+1.32)

=19.1+10

=29.1;

②19.32-5.56-3.44+0.68

=19.32+0.68-(5.56+3.44)

=20-9

=11;

③37.62-(7.62+3.25)

=37.62-7.62-3.25

=30-3.25

=26.75;

④5.49+2.68-3.49+6.32

=5.49-3.49+(2.68+6.32)

=2+9

=11.

单项选择题
问答题 简答题