题目内容
计算下面各题,能简便计算就简便计算.
| 429+31.1+2.04 | 100-27.2-42.8 | 9-(3.02+1.25) | 1.8-1.57+0.2. |
(1)429+31.1+2.04,
=429+(31.1+2.04),
=429+33.14,
=462.14,
(2)100-27.2-42.8,
=100-(27.2+42.8),
=100-70,
=30,
(3)9-(3.02+1.25),
=9-4.27,
=4.73,
(4)1.8-1.57+0.2,
=1.8+0.2-1.57,
=2-1.57,
=0.43.
=429+(31.1+2.04),
=429+33.14,
=462.14,
(2)100-27.2-42.8,
=100-(27.2+42.8),
=100-70,
=30,
(3)9-(3.02+1.25),
=9-4.27,
=4.73,
(4)1.8-1.57+0.2,
=1.8+0.2-1.57,
=2-1.57,
=0.43.
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