题目内容
| 5 |
| 9 |
| 3 |
| 4 |
| 5 |
| 9 |
| 1 |
| 4 |
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
17×
| 9 |
| 16 |
考点:分数的四则混合运算,分数的简便计算
专题:运算定律及简算
分析:利用乘法分配律逐一计算即可.
解答:
解:(1)
×
+
×
=
×(
+
)
=
×1
=
;
(2)
÷7+
×
=
×
+
×
=(
+
)×
=1×
=
;
(3)17×
=16×
+1×
=16+
=16
.
| 5 |
| 9 |
| 3 |
| 4 |
| 5 |
| 9 |
| 1 |
| 4 |
=
| 5 |
| 9 |
| 3 |
| 4 |
| 1 |
| 4 |
=
| 5 |
| 9 |
=
| 5 |
| 9 |
(2)
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=(
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
(3)17×
| 9 |
| 16 |
=16×
| 9 |
| 16 |
| 9 |
| 16 |
=16+
| 9 |
| 16 |
=16
| 9 |
| 16 |
点评:分数四则混合运算的关键是搞清运算顺序,正确利用运算定律简算.
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