题目内容
下面各题怎样算简便就怎样算.
÷0.6×
÷9+
×
2-
÷
-
.
| 18 |
| 35 |
| 2 |
| 3 |
| 5 |
| 17 |
| 1 |
| 9 |
| 12 |
| 17 |
2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
分析:(1)按照从左到右的顺序计算;
(2)先把除法变成乘法,再运用乘法分配律简算;
(3)先算除法,再根据连续减去两个数,等于减去这两个数的和简算.
(2)先把除法变成乘法,再运用乘法分配律简算;
(3)先算除法,再根据连续减去两个数,等于减去这两个数的和简算.
解答:解:(1)
÷0.6×
,
=
×
,
=
;
(2)
÷9+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
;
(3)2-
÷
-
,
=2-
-
,
=2-(
+
),
=2-2,
=0.
| 18 |
| 35 |
| 2 |
| 3 |
=
| 6 |
| 7 |
| 2 |
| 3 |
=
| 4 |
| 7 |
(2)
| 5 |
| 17 |
| 1 |
| 9 |
| 12 |
| 17 |
=
| 5 |
| 17 |
| 1 |
| 9 |
| 1 |
| 9 |
| 12 |
| 17 |
=(
| 5 |
| 17 |
| 12 |
| 17 |
| 1 |
| 9 |
=1×
| 1 |
| 9 |
=
| 1 |
| 9 |
(3)2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
=2-
| 4 |
| 3 |
| 2 |
| 3 |
=2-(
| 4 |
| 3 |
| 2 |
| 3 |
=2-2,
=0.
点评:本题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进行简便计算.
练习册系列答案
相关题目