题目内容
怎样算简便就怎样算.
×3+
×5
4×(
+
)
×
+
×
×6-
8-14×
×
+
÷3.
| 1 |
| 2 |
| 1 |
| 2 |
4×(
| 3 |
| 16 |
| 3 |
| 4 |
| 7 |
| 9 |
| 3 |
| 10 |
| 7 |
| 10 |
| 7 |
| 9 |
| 3 |
| 5 |
| 3 |
| 5 |
8-14×
| 2 |
| 7 |
| 4 |
| 9 |
| 1 |
| 3 |
| 5 |
| 9 |
分析:(1)(2)(3)(4)运用乘法分配律简算;
(5)先算乘法,再算减法;
(6)把除法改为乘法,运用乘法分配律简算.
(5)先算乘法,再算减法;
(6)把除法改为乘法,运用乘法分配律简算.
解答:解:(1)
×3+
×5,
=
×(3+5),
=
×8,
=4;
(2)4×(
+
),
=4×
+
×4,
=
+3,
=3
;
(3)
×
+
×
,
=
×(
+
),
=
×1,
=
;
(4)
×6-
=
×(6-1),
=
×5,
=3;
(5)8-14×
,
=8-4,
=4;
(6)
×
+
÷3,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
| 1 |
| 2 |
| 1 |
| 2 |
=
| 1 |
| 2 |
=
| 1 |
| 2 |
=4;
(2)4×(
| 3 |
| 16 |
| 3 |
| 4 |
=4×
| 3 |
| 16 |
| 3 |
| 4 |
=
| 3 |
| 4 |
=3
| 3 |
| 4 |
(3)
| 7 |
| 9 |
| 3 |
| 10 |
| 7 |
| 10 |
| 7 |
| 9 |
=
| 7 |
| 9 |
| 3 |
| 10 |
| 7 |
| 10 |
=
| 7 |
| 9 |
=
| 7 |
| 9 |
(4)
| 3 |
| 5 |
| 3 |
| 5 |
=
| 3 |
| 5 |
=
| 3 |
| 5 |
=3;
(5)8-14×
| 2 |
| 7 |
=8-4,
=4;
(6)
| 4 |
| 9 |
| 1 |
| 3 |
| 5 |
| 9 |
=
| 4 |
| 9 |
| 1 |
| 3 |
| 5 |
| 9 |
| 1 |
| 3 |
=(
| 4 |
| 9 |
| 5 |
| 9 |
| 1 |
| 3 |
=1×
| 1 |
| 3 |
=
| 1 |
| 3 |
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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