题目内容
计算
(1)1800-1350÷18×6
(2)(1-1%×70)÷
(3)
÷
-
×
(4)
÷7+
×
(5)
×9+
(6)2-
÷
-
.
(1)1800-1350÷18×6
(2)(1-1%×70)÷
| 2 |
| 7 |
(3)
| 19 |
| 13 |
| 7 |
| 5 |
| 6 |
| 13 |
| 5 |
| 7 |
(4)
| 8 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
(5)
| 7 |
| 9 |
| 7 |
| 9 |
(6)2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
分析:第一、二题按整数、分数、百分数四则混合运算法则计算,第三、四、五应用乘法分配律进行简便计算,第六题应用减法的性质计算.
解答:解:(1)1800-1350÷18×6,
=1800-75×6,
=1800-450,
=1350;
(2)(1-1%×70)÷
,
=(1-70%)÷
,
=
×
,
=
;
(3)
÷
-
×
,
=(
-
)×
,
=
;
(4)
÷7+
×
,
=(
+
)×
,
=
×
,
=
;
(5)
×9+
,
=(9+1)×
,
=
,
(6)2-
÷
-
,
=2-
×
-
,
=2-(
+
),
=0.
故答案为:(1)1350(2)
(3)
(4)
(5)
(6)0.
=1800-75×6,
=1800-450,
=1350;
(2)(1-1%×70)÷
| 2 |
| 7 |
=(1-70%)÷
| 2 |
| 7 |
=
| 3 |
| 10 |
| 7 |
| 2 |
=
| 21 |
| 20 |
(3)
| 19 |
| 13 |
| 7 |
| 5 |
| 6 |
| 13 |
| 5 |
| 7 |
=(
| 19 |
| 13 |
| 6 |
| 13 |
| 5 |
| 7 |
=
| 5 |
| 7 |
(4)
| 8 |
| 13 |
| 1 |
| 7 |
| 6 |
| 13 |
=(
| 8 |
| 13 |
| 6 |
| 13 |
| 1 |
| 7 |
=
| 14 |
| 13 |
| 1 |
| 7 |
=
| 2 |
| 13 |
(5)
| 7 |
| 9 |
| 7 |
| 9 |
=(9+1)×
| 7 |
| 9 |
=
| 70 |
| 9 |
(6)2-
| 6 |
| 13 |
| 9 |
| 26 |
| 2 |
| 3 |
=2-
| 6 |
| 13 |
| 26 |
| 9 |
| 2 |
| 3 |
=2-(
| 4 |
| 3 |
| 2 |
| 3 |
=0.
故答案为:(1)1350(2)
| 21 |
| 20 |
| 5 |
| 7 |
| 2 |
| 13 |
| 70 |
| 9 |
点评:此六道题主要考查分数、小数、整数、百分数四则混合运算法则及应用运算定律进行简便计算.
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