题目内容
3-
|
10÷(
|
| ||||||||||||||||||
(35+
|
|
|
分析:(1)先算除法,再算减法;
(2)先算小括号里面的加法,再算括号外的除法;
(3)先算除法,再算加法;
(4)(5)先把除法变成乘法,再算运用乘法分配律简算;
(6)先同时运算除法,再算减法.
(2)先算小括号里面的加法,再算括号外的除法;
(3)先算除法,再算加法;
(4)(5)先把除法变成乘法,再算运用乘法分配律简算;
(6)先同时运算除法,再算减法.
解答:解:(1)3-
÷
=3-
=2
;
(2)10÷(
+
)
=10÷
=
;
(3)
÷
+
=
+
=
;
(4)(35+
)÷5
=(35+
)×
=35×
+
×
=7+
=7
;
(5)
÷
+
÷
=
×
+
×
=(
+
)×
=1×
=
;
(6)
÷
-
÷
=
-2
=
.
| 2 |
| 5 |
| 3 |
| 5 |
=3-
| 2 |
| 3 |
=2
| 1 |
| 3 |
(2)10÷(
| 1 |
| 2 |
| 1 |
| 5 |
=10÷
| 7 |
| 10 |
=
| 100 |
| 7 |
(3)
| 2 |
| 15 |
| 2 |
| 5 |
| 1 |
| 4 |
=
| 1 |
| 3 |
| 1 |
| 4 |
=
| 7 |
| 12 |
(4)(35+
| 5 |
| 7 |
=(35+
| 5 |
| 7 |
| 1 |
| 5 |
=35×
| 1 |
| 5 |
| 5 |
| 7 |
| 1 |
| 5 |
=7+
| 1 |
| 7 |
=7
| 1 |
| 7 |
(5)
| 3 |
| 7 |
| 7 |
| 8 |
| 4 |
| 7 |
| 7 |
| 8 |
=
| 3 |
| 7 |
| 8 |
| 7 |
| 4 |
| 7 |
| 8 |
| 7 |
=(
| 3 |
| 7 |
| 4 |
| 7 |
| 8 |
| 7 |
=1×
| 8 |
| 7 |
=
| 8 |
| 7 |
(6)
| 7 |
| 8 |
| 1 |
| 9 |
| 2 |
| 9 |
| 1 |
| 9 |
=
| 63 |
| 8 |
=
| 47 |
| 8 |
点评:本题考查了四则混合运算,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