题目内容
计算.
(
-
)×48
×34×
(
+
)×
-
÷12.
(
| 3 |
| 8 |
| 1 |
| 6 |
| 2 |
| 17 |
| 2 |
| 17 |
(
| 5 |
| 4 |
| 5 |
| 12 |
| 2 |
| 15 |
| 3 |
| 4 |
| 3 |
| 10 |
分析:(1)利用乘法分配律简算;
(2)按照从左到右的顺序计算;
(3)利用乘法分配律简算;
(4)先算除法,再算减法.
(2)按照从左到右的顺序计算;
(3)利用乘法分配律简算;
(4)先算除法,再算减法.
解答:解:(1)(
-
)×48
=
×48-
×48
=18-8
=10;
(2)
×34×
=4×
=
;
(3)(
+
)×
=
×
+
×
=
+
=
;
(4)
-
÷12
=
-
×
=
-
=
.
| 3 |
| 8 |
| 1 |
| 6 |
=
| 3 |
| 8 |
| 1 |
| 6 |
=18-8
=10;
(2)
| 2 |
| 17 |
| 2 |
| 17 |
=4×
| 2 |
| 17 |
=
| 8 |
| 17 |
(3)(
| 5 |
| 4 |
| 5 |
| 12 |
| 2 |
| 15 |
=
| 5 |
| 4 |
| 2 |
| 15 |
| 5 |
| 12 |
| 2 |
| 15 |
=
| 1 |
| 6 |
| 1 |
| 18 |
=
| 2 |
| 9 |
(4)
| 3 |
| 4 |
| 3 |
| 10 |
=
| 3 |
| 4 |
| 3 |
| 10 |
| 1 |
| 12 |
=
| 3 |
| 4 |
| 1 |
| 40 |
=
| 29 |
| 40 |
点评:此题考查分数四则混合运算的计算方法,注意数字特点,灵活选用运算定律简算.
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