题目内容
| 计算下面各题,后两题用简便方法计算. 1-
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(
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分析:(1)先算除法,再算减法;
(2)(3)按照从左到右的顺序一次计算即可;
(4)先算乘法,再算加法;
(5)(6)利用乘法分配律简算即可.
(2)(3)按照从左到右的顺序一次计算即可;
(4)先算乘法,再算加法;
(5)(6)利用乘法分配律简算即可.
解答:解:(1)1-
÷
,
=1-
×
,
=1-
,
=
;
(2)
×12÷
,
=
×12×
,
=8;
(3)
÷
÷
,
=
×
×
,
=
;
(4)
+
×
,
=
+
,
=1;
(5)(
+
)×36,
=
×36+
×36,
=9+8,
=17;
(1)
×
+
÷8,
=
×
+
×
,
=
×(
+
),
=
×
,
=
.
| 7 |
| 9 |
| 7 |
| 8 |
=1-
| 7 |
| 9 |
| 8 |
| 7 |
=1-
| 8 |
| 9 |
=
| 1 |
| 9 |
(2)
| 1 |
| 5 |
| 3 |
| 10 |
=
| 1 |
| 5 |
| 10 |
| 3 |
=8;
(3)
| 5 |
| 6 |
| 2 |
| 3 |
| 5 |
| 6 |
=
| 5 |
| 6 |
| 3 |
| 2 |
| 6 |
| 5 |
=
| 3 |
| 2 |
(4)
| 3 |
| 5 |
| 1 |
| 2 |
| 4 |
| 5 |
=
| 3 |
| 5 |
| 2 |
| 5 |
=1;
(5)(
| 1 |
| 4 |
| 2 |
| 9 |
=
| 1 |
| 4 |
| 2 |
| 9 |
=9+8,
=17;
(1)
| 1 |
| 8 |
| 5 |
| 12 |
| 11 |
| 12 |
=
| 1 |
| 8 |
| 5 |
| 12 |
| 11 |
| 12 |
| 1 |
| 8 |
=
| 1 |
| 8 |
| 5 |
| 12 |
| 11 |
| 12 |
=
| 1 |
| 8 |
| 4 |
| 3 |
=
| 1 |
| 6 |
点评:计算注意运算顺序,抓住数字特点,灵活应用运算定律进行计算.
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