题目内容
计算下面各题.(能简算的要简算)
×
÷
[
-(
-
)]÷
×
+
÷6
5×4×(
×
)
| 7 |
| 16 |
| 12 |
| 35 |
| 3 |
| 20 |
[
| 7 |
| 8 |
| 5 |
| 16 |
| 1 |
| 4 |
| 26 |
| 27 |
| 7 |
| 4 |
| 5 |
| 6 |
| 7 |
| 4 |
5×4×(
| 1 |
| 5 |
| 3 |
| 4 |
分析:(1)先算乘法,再算除法;
(2)先算小括号里面的减法,再算中括号里面的减法.最后算除法;
(3)根据乘法分配律进行计算;
(4)根据乘法交换律和结合律进行计算.
(2)先算小括号里面的减法,再算中括号里面的减法.最后算除法;
(3)根据乘法分配律进行计算;
(4)根据乘法交换律和结合律进行计算.
解答:解:
(1)
×
÷
,
=
÷
,
=1;
(2)[
-(
-
)]÷
,
=[
-
]÷
,
=
÷
,
=
;
(3)
×
+
÷6,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(4)5×4×(
×
),
=(5×
)×(4×
),
=1×3,
=3.
(1)
| 7 |
| 16 |
| 12 |
| 35 |
| 3 |
| 20 |
=
| 3 |
| 20 |
| 3 |
| 20 |
=1;
(2)[
| 7 |
| 8 |
| 5 |
| 16 |
| 1 |
| 4 |
| 26 |
| 27 |
=[
| 7 |
| 8 |
| 1 |
| 16 |
| 26 |
| 27 |
=
| 13 |
| 16 |
| 26 |
| 27 |
=
| 27 |
| 32 |
(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: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律简便计算.
练习册系列答案
相关题目