题目内容
计算下面各题,能简算的要简算
(1)(
+
-
)×96
(2)
÷[(
+
)×
].
(1)(
| 7 |
| 8 |
| 7 |
| 12 |
| 5 |
| 6 |
(2)
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
| 1 |
| 13 |
分析:(1)根据数字特点,运用乘法分配律进行简算;
(2)按运算顺序进行计算,先算小括号内的,再算中括号内的,最后算括号外的.
(2)按运算顺序进行计算,先算小括号内的,再算中括号内的,最后算括号外的.
解答:解:(1)(
+
-
)×96,
=
×96+
×96-
×96,
=84+56-80,
=(84-80)+56,
=4+56,
=60;
(2)
÷[(
+
)×
],
=
÷[
×
],
=
÷
,
=
×15,
=3.
| 7 |
| 8 |
| 7 |
| 12 |
| 5 |
| 6 |
=
| 7 |
| 8 |
| 7 |
| 12 |
| 5 |
| 6 |
=84+56-80,
=(84-80)+56,
=4+56,
=60;
(2)
| 1 |
| 5 |
| 2 |
| 3 |
| 1 |
| 5 |
| 1 |
| 13 |
=
| 1 |
| 5 |
| 13 |
| 15 |
| 1 |
| 13 |
=
| 1 |
| 5 |
| 1 |
| 15 |
=
| 1 |
| 5 |
=3.
点评:此题主要考查学生对乘法分配律以及对四则混合运算顺序的掌握情况.
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