问题
解答题
能简算的就简算.
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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.