题目内容
| 下面各题,怎样简便就怎样算. 13.1-4.12+(6.9+4.12) | 28×(
| ||||||
| 94.6×18+5.4×18 | 4800÷(198-138)×80. |
(1)13.1-4.12+(6.9+4.12),
=13.1-4.12+6.9+4.12,
=(13.1+6.9)+(4.12-4.12),
=20;
(2)28×(
+
-
),
=28×
+28×
-28×
,
=21+4-3,
=22;
(3)94.6×18+5.4×18,
=(94.6+5.4)×18,
=100×18,
=1800;
(4)4800÷(198-138)×80,
=4800÷60×80,
=80×80,
=6400.
=13.1-4.12+6.9+4.12,
=(13.1+6.9)+(4.12-4.12),
=20;
(2)28×(
| 3 |
| 4 |
| 1 |
| 7 |
| 3 |
| 28 |
=28×
| 3 |
| 4 |
| 1 |
| 7 |
| 3 |
| 28 |
=21+4-3,
=22;
(3)94.6×18+5.4×18,
=(94.6+5.4)×18,
=100×18,
=1800;
(4)4800÷(198-138)×80,
=4800÷60×80,
=80×80,
=6400.
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