问题
解答题
计算下面各题(能简算的要简算) (1)
(2)2.5×2.72+0.24×2.5+1.04×2.5 (3)200-120÷1.6×1.2. |
答案
(1)
×101-7 25
,7 25
=
×(101-1),7 25
=
×100,7 25
=28;
(2)2.5×2.72+0.24×2.5+1.04×2.5,
=2.5×(2.72+0.24+1.04),
=2.5×4,
=10;
(3)200-120÷1.6×1.2,
=200-(120÷4)×(1.2÷0.4),
=200-30×3,
=200-90,
=110.