题目内容
怎样简便怎样算.
48×(
+
)
3×25%+3×
÷
+
÷
.
48×(
| 1 |
| 8 |
| 1 |
| 6 |
3×25%+3×
| 3 |
| 4 |
| 2 |
| 5 |
| 4 |
| 3 |
| 1 |
| 5 |
| 4 |
| 3 |
考点:分数的简便计算
专题:运算定律及简算
分析:(1)(2)运用乘法分配律简算;
(3)先把除法变成除法,再运用乘法分配律简算.
(3)先把除法变成除法,再运用乘法分配律简算.
解答:
解:(1)48×(
+
)
=48×
+48×
=6+8
=14;
(2)3×25%+3×
=3×(25%+
)
=3×1
=3;
(3)
÷
+
÷
=
×
+
×
=(
+
)×
=
×
=
.
| 1 |
| 8 |
| 1 |
| 6 |
=48×
| 1 |
| 8 |
| 1 |
| 6 |
=6+8
=14;
(2)3×25%+3×
| 3 |
| 4 |
=3×(25%+
| 3 |
| 4 |
=3×1
=3;
(3)
| 2 |
| 5 |
| 4 |
| 3 |
| 1 |
| 5 |
| 4 |
| 3 |
=
| 2 |
| 5 |
| 3 |
| 4 |
| 1 |
| 5 |
| 3 |
| 4 |
=(
| 2 |
| 5 |
| 1 |
| 5 |
| 3 |
| 4 |
=
| 3 |
| 5 |
| 3 |
| 4 |
=
| 9 |
| 20 |
点评:此题是考查四则混合运算,要仔细观察算式的特点,灵活运用一些定律进行简便计算.
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