题目内容
脱式计算(能简便计算就要用简便方法计算)
(1)(20-6.9÷0.46)×4.5
(2)23×(
+
)×27.
(1)(20-6.9÷0.46)×4.5
(2)23×(
| 5 |
| 23 |
| 2 |
| 27 |
(1)(20-6.9÷0.46)×4.5,
=(20-15)×4.5,
=5×4.5,
=22.5;
(2)23×(
+
)×27,
=23×27×
+23×27×
,
=135+46,
=181.
=(20-15)×4.5,
=5×4.5,
=22.5;
(2)23×(
| 5 |
| 23 |
| 2 |
| 27 |
=23×27×
| 5 |
| 23 |
| 2 |
| 27 |
=135+46,
=181.
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