题目内容
计算下面各题,怎样算简便就怎样算.
÷
-
×
-
÷
+
×
+
÷8
[
-(
-
)]×
.
| 1 |
| 10 |
| 3 |
| 20 |
| 5 |
| 8 |
| 2 |
| 5 |
| 5 |
| 8 |
| 6 |
| 25 |
| 2 |
| 5 |
| 1 |
| 4 |
| 1 |
| 8 |
| 5 |
| 9 |
| 4 |
| 9 |
[
| 5 |
| 6 |
| 1 |
| 2 |
| 1 |
| 3 |
| 9 |
| 10 |
分析:(1)先算除法和乘法,再算减法;
(2)先算除法,再按照从左向右的顺序进行计算;
(3)根据乘法分配律进行简算;
(4)先算小括号里面的减法,再算中括号里面的减法,最后算乘法.
(2)先算除法,再按照从左向右的顺序进行计算;
(3)根据乘法分配律进行简算;
(4)先算小括号里面的减法,再算中括号里面的减法,最后算乘法.
解答:解:
(1)
÷
-
×
,
=
-
,
=
;
(2)
-
÷
+
,
=
-
+
,
=
+
,
=
;
(3)
×
+
÷8,
=
×
+
×
,
=
×(
+
),
=
;
(4)[
-(
-
)]×
,
=[
-
]×
,
=
×
,
=
.
(1)
| 1 |
| 10 |
| 3 |
| 20 |
| 5 |
| 8 |
| 2 |
| 5 |
=
| 2 |
| 3 |
| 1 |
| 4 |
=
| 5 |
| 12 |
(2)
| 5 |
| 8 |
| 6 |
| 25 |
| 2 |
| 5 |
| 1 |
| 4 |
=
| 5 |
| 8 |
| 3 |
| 5 |
| 1 |
| 4 |
=
| 1 |
| 40 |
| 1 |
| 4 |
=
| 11 |
| 40 |
(3)
| 1 |
| 8 |
| 5 |
| 9 |
| 4 |
| 9 |
=
| 1 |
| 8 |
| 5 |
| 9 |
| 4 |
| 9 |
| 1 |
| 8 |
=
| 1 |
| 8 |
| 5 |
| 9 |
| 4 |
| 9 |
=
| 1 |
| 8 |
(4)[
| 5 |
| 6 |
| 1 |
| 2 |
| 1 |
| 3 |
| 9 |
| 10 |
=[
| 5 |
| 6 |
| 1 |
| 6 |
| 9 |
| 10 |
=
| 2 |
| 3 |
| 9 |
| 10 |
=
| 3 |
| 5 |
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.
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