题目内容
| 计算(写出计算步骤): (1)
|
(2)1-
|
(3)(
|
分析:(1)从左往右依次计算;
(2)先算乘除,再算减法;
(3)根据乘法分配律进行计算.
(2)先算乘除,再算减法;
(3)根据乘法分配律进行计算.
解答:解:(1)
-
+1
=
+1
=2
;
(2)1-
÷3×
=1-
×
=1-
=
;
(3)(
-
)×
=
×
-
×
=
-
=
.
| 3 |
| 4 |
| 5 |
| 12 |
| 5 |
| 6 |
=
| 1 |
| 3 |
| 5 |
| 6 |
=2
| 1 |
| 6 |
(2)1-
| 3 |
| 8 |
| 2 |
| 3 |
=1-
| 1 |
| 8 |
| 2 |
| 3 |
=1-
| 1 |
| 12 |
=
| 11 |
| 12 |
(3)(
| 14 |
| 15 |
| 7 |
| 24 |
| 3 |
| 2 |
=
| 14 |
| 15 |
| 3 |
| 2 |
| 7 |
| 24 |
| 3 |
| 2 |
=
| 7 |
| 5 |
| 7 |
| 16 |
=
| 77 |
| 80 |
点评:考查了运算定律与简便运算,四则混合运算.注意运算顺序和运算法则,灵活运用所学的运算定律简便计算.
练习册系列答案
相关题目