题目内容
能简算的要简算.
÷
+
÷
(
-
)×12
+
×
+
×15+
.
| 3 |
| 7 |
| 7 |
| 11 |
| 4 |
| 7 |
| 7 |
| 11 |
(
| 1 |
| 3 |
| 1 |
| 4 |
| 5 |
| 2 |
| 5 |
| 2 |
| 3 |
| 5 |
| 2 |
| 5 |
| 15 |
| 16 |
| 15 |
| 16 |
分析:(1)运用除法的性质简算;
(2)(4)运用乘法分配律简算;
(3)先算乘法,然后从左往右依次运算.
(2)(4)运用乘法分配律简算;
(3)先算乘法,然后从左往右依次运算.
解答:解:(1)
÷
+
÷
,
=(
+
)÷
,
=1×
,
=
;
(2)(
-
)×12,
=
×12-
×12,
=4-3,
=1;
(3)
+
×
+
,
=
+
+
,
=4+
,
=4
;
(4)
×15+
,
=
×(15+1),
=
×16,
=15.
| 3 |
| 7 |
| 7 |
| 11 |
| 4 |
| 7 |
| 7 |
| 11 |
=(
| 3 |
| 7 |
| 4 |
| 7 |
| 7 |
| 11 |
=1×
| 11 |
| 7 |
=
| 11 |
| 7 |
(2)(
| 1 |
| 3 |
| 1 |
| 4 |
=
| 1 |
| 3 |
| 1 |
| 4 |
=4-3,
=1;
(3)
| 5 |
| 2 |
| 5 |
| 2 |
| 3 |
| 5 |
| 2 |
| 5 |
=
| 5 |
| 2 |
| 3 |
| 2 |
| 2 |
| 5 |
=4+
| 2 |
| 5 |
=4
| 2 |
| 5 |
(4)
| 15 |
| 16 |
| 15 |
| 16 |
=
| 15 |
| 16 |
=
| 15 |
| 16 |
=15.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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