题目内容
| 计算下列各题,能简算的要简算. (
|
|
|
| ||||||||||||||||||||||||||||
| 20-
|
| 7.35×99+7.35 |
考点:分数的四则混合运算,运算定律与简便运算
专题:运算顺序及法则
分析:(1)先算减法,再算除法;
(2)根据乘法分配律进行简算;
(3)按照从左向右的顺序进行计算;
(4)根据加法交换律和结合律进行简算;
(5)根据乘法分配律进行简算;
(6)先算,再算除法减法;
(7)按照从左向右的顺序进行计算;
(8)根据乘法分配律进行简算.
(2)根据乘法分配律进行简算;
(3)按照从左向右的顺序进行计算;
(4)根据加法交换律和结合律进行简算;
(5)根据乘法分配律进行简算;
(6)先算,再算除法减法;
(7)按照从左向右的顺序进行计算;
(8)根据乘法分配律进行简算.
解答:
解:(1)(
-
)÷
=
÷
=
;
(2)
×
+
×
=
×(
+
)
=
×
=
;
(3)
÷
÷
=
÷
=
;
(4)
+
+
+
=(
+
)+(
+
)
=1+2
=3;
(5)
÷7+
×
=
×
+
×
=(
+
)×
=1×
=
;
(6)20-
÷
=20-
=19
;
(7)
×8÷
=
÷
=2;
(8)7.35×99+7.35
=7.35×(99+1)
=7.35×100
=735.
| 3 |
| 4 |
| 1 |
| 8 |
| 5 |
| 12 |
=
| 5 |
| 8 |
| 5 |
| 12 |
=
| 3 |
| 2 |
(2)
| 1 |
| 7 |
| 6 |
| 13 |
| 8 |
| 13 |
| 1 |
| 7 |
=
| 1 |
| 7 |
| 6 |
| 13 |
| 8 |
| 13 |
=
| 1 |
| 7 |
| 14 |
| 13 |
=
| 2 |
| 13 |
(3)
| 5 |
| 6 |
| 8 |
| 9 |
| 1 |
| 3 |
=
| 15 |
| 16 |
| 1 |
| 3 |
=
| 45 |
| 16 |
(4)
| 7 |
| 17 |
| 5 |
| 6 |
| 10 |
| 17 |
| 7 |
| 6 |
=(
| 7 |
| 17 |
| 10 |
| 17 |
| 5 |
| 6 |
| 7 |
| 6 |
=1+2
=3;
(5)
| 8 |
| 13 |
| 1 |
| 7 |
| 5 |
| 13 |
=
| 8 |
| 13 |
| 1 |
| 7 |
| 1 |
| 7 |
| 5 |
| 13 |
=(
| 8 |
| 13 |
| 5 |
| 13 |
| 1 |
| 7 |
=1×
| 1 |
| 7 |
=
| 1 |
| 7 |
(6)20-
| 7 |
| 9 |
| 7 |
| 8 |
=20-
| 8 |
| 9 |
=19
| 1 |
| 9 |
(7)
| 1 |
| 5 |
| 4 |
| 5 |
=
| 8 |
| 5 |
| 4 |
| 5 |
=2;
(8)7.35×99+7.35
=7.35×(99+1)
=7.35×100
=735.
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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