问题 解答题
能简算的就简算.
①2.983+0.53+1.25②23.75-3.625-0.375③5.1+0.9-5.1+0.9
④49.3-28.5+20.5⑤6.32-(5.26-3.52)⑥10.75+0.4+0.25.
答案

①2.983+0.53+1.25,

=3.513+1.25,

=4.763;

②23.75-3.625-0.375,

=23.75-(3.625+0.375),

=23.75-4,

=19.75;

③5.1+0.9-5.1+0.9,

=(5.1-5.1)+(0.9+0.9),

=1.8;

④49.3-28.5+20.5,

=49.3-(28.5-20.5),

=49.3-8,

=41.3;

⑤6.32-(5.26-3.52),

=6.32-1.74,

=4.58;

⑥10.75+0.4+0.25,

=(10.75+0.25)+0.4,

=11+0.4,

=11.4.

单项选择题 A2型题
单项选择题