题目内容
脱式计算:(能简算的要简算)
12.8+1.9+15.94;
7.69+(4.76-1.96);
4.68+2.72+7.32;
25.06-2.65-8.35.
12.8+1.9+15.94;
7.69+(4.76-1.96);
4.68+2.72+7.32;
25.06-2.65-8.35.
(1)12.8+1.9+15.94,
=14.7+15.94,
=30.64;
(2)7.69+(4.76-1.96),
=7.69+2.8,
=10.49;
(3)4.68+2.72+7.32,
=(4.68+7.32)+2.72,
=12+2.72,
=14.72;
(4)25.06-2.65-8.35,
=25.06-(2.65+8.35),
=25.06-11,
=14.06.
=14.7+15.94,
=30.64;
(2)7.69+(4.76-1.96),
=7.69+2.8,
=10.49;
(3)4.68+2.72+7.32,
=(4.68+7.32)+2.72,
=12+2.72,
=14.72;
(4)25.06-2.65-8.35,
=25.06-(2.65+8.35),
=25.06-11,
=14.06.
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