题目内容
脱式计算.(能简算的要简算)
×
÷
26×(
+
)
×
+
÷6
5×4×(
×
)
| 7 |
| 16 |
| 12 |
| 35 |
| 3 |
| 20 |
26×(
| 5 |
| 6 |
| 3 |
| 7 |
| 7 |
| 4 |
| 5 |
| 6 |
| 7 |
| 4 |
5×4×(
| 1 |
| 5 |
| 3 |
| 4 |
考点:分数的四则混合运算,分数的简便计算
专题:运算顺序及法则,运算定律及简算
分析:(1)把除法改为乘法约分计算;
(2)先算加法,再算乘法;
(3)利用乘法分配律简算;
(4)利用乘法交换律与结合律简算.
(2)先算加法,再算乘法;
(3)利用乘法分配律简算;
(4)利用乘法交换律与结合律简算.
解答:
解:(1)
×
÷
=
×
×
=1;
(2)26×(
+
)
=26×
=
;
(3)
×
+
÷6
=
×
+
×
=
×(
+
)
=
×1
=
;
(4)5×4×(
×
)
=5×
×(
×4)
=1×3
=3.
| 7 |
| 16 |
| 12 |
| 35 |
| 3 |
| 20 |
=
| 7 |
| 16 |
| 12 |
| 35 |
| 20 |
| 3 |
=1;
(2)26×(
| 5 |
| 6 |
| 3 |
| 7 |
=26×
| 53 |
| 42 |
=
| 689 |
| 21 |
(3)
| 7 |
| 4 |
| 5 |
| 6 |
| 7 |
| 4 |
=
| 7 |
| 4 |
| 5 |
| 6 |
| 7 |
| 4 |
| 1 |
| 6 |
=
| 7 |
| 4 |
| 5 |
| 6 |
| 1 |
| 6 |
=
| 7 |
| 4 |
=
| 7 |
| 4 |
(4)5×4×(
| 1 |
| 5 |
| 3 |
| 4 |
=5×
| 1 |
| 5 |
| 3 |
| 4 |
=1×3
=3.
点评:分数四则混合运算的关键是抓住运算顺序,正确使用运算定律简算.
练习册系列答案
相关题目