题目内容
计算下面各题.
|
| ||||||||||||||
15×(
|
|
分析:横向数:
(1)按照先算乘法,再算加法顺序解答,
(2)(3)(4)运用乘法分配律解答.
(1)按照先算乘法,再算加法顺序解答,
(2)(3)(4)运用乘法分配律解答.
解答:解:
+
×
=
+
=
;
×
+
×
=
×(
+
)
=
×1
=
;
15×(
+
)
=15×
+15×
=3+5
=8;
÷13+
×
=
×(
+
)
=
×1
=
.
| 1 |
| 4 |
| 5 |
| 8 |
| 4 |
| 5 |
=
| 1 |
| 4 |
| 1 |
| 2 |
=
| 3 |
| 4 |
| 3 |
| 5 |
| 1 |
| 4 |
| 3 |
| 4 |
| 3 |
| 5 |
=
| 3 |
| 5 |
| 1 |
| 4 |
| 3 |
| 4 |
=
| 3 |
| 5 |
=
| 3 |
| 5 |
15×(
| 1 |
| 5 |
| 1 |
| 3 |
=15×
| 1 |
| 5 |
| 1 |
| 3 |
=3+5
=8;
| 7 |
| 10 |
| 12 |
| 13 |
| 7 |
| 10 |
=
| 7 |
| 10 |
| 1 |
| 13 |
| 12 |
| 13 |
=
| 7 |
| 10 |
=
| 7 |
| 10 |
点评:(1)依据四则运算顺序正确进行计算,(2)运用乘法分配律解决问题,是本题考查知识点.
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