题目内容
用简便方法计算
(1)[45-(
-
+
)×36]÷5
(2)-
×(-92)+(-
)×34
+
×23
.
(1)[45-(
| 7 |
| 9 |
| 11 |
| 12 |
| 5 |
| 6 |
(2)-
| 2 |
| 9 |
| 2 |
| 9 |
| 3 |
| 5 |
| 2 |
| 9 |
| 3 |
| 5 |
(1)[45-(
-
+
)×36]÷5,
=[45-
×36-(-
)×36-
×36]÷5,
=(45-28+33-30)÷5,
=(78-58)÷5,
=20÷5,
=4;
(2)-
×(-92)+(-
)×34
+
×23
,
=
×92-
×34
+
×23
,
=
×(92-34
+23
),
=
×(92-11),
=
×81,
=18.
| 7 |
| 9 |
| 11 |
| 12 |
| 5 |
| 6 |
=[45-
| 7 |
| 9 |
| 11 |
| 12 |
| 5 |
| 6 |
=(45-28+33-30)÷5,
=(78-58)÷5,
=20÷5,
=4;
(2)-
| 2 |
| 9 |
| 2 |
| 9 |
| 3 |
| 5 |
| 2 |
| 9 |
| 3 |
| 5 |
=
| 2 |
| 9 |
| 2 |
| 9 |
| 3 |
| 5 |
| 2 |
| 9 |
| 3 |
| 5 |
=
| 2 |
| 9 |
| 3 |
| 5 |
| 3 |
| 5 |
=
| 2 |
| 9 |
=
| 2 |
| 9 |
=18.
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