脱式计算:(能简算的要简算)12.8+1.9+15.94;7.69+(4.76-1.9

2024-12-26 16:46:23
推荐回答(1个)
回答1:

(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.