题目内容
简便计算
(1)2014×0.1+2014×
=
(2)(
+
)×19×23
(3)18
-(8
-1
)=
(4)
×27+
×41=
(5)(9
+7
)÷(
+
)=
(6)
+
+
=
(1)2014×0.1+2014×
| 9 |
| 10 |
(2)(
| 3 |
| 19 |
| 2 |
| 23 |
(3)18
| 5 |
| 9 |
| 5 |
| 9 |
| 3 |
| 7 |
(4)
| 1 |
| 5 |
| 3 |
| 5 |
(5)(9
| 2 |
| 7 |
| 2 |
| 9 |
| 5 |
| 7 |
| 5 |
| 9 |
(6)
| 1 |
| 31 |
| 303 |
| 3131 |
| 50505 |
| 313131 |
考点:分数的简便计算
专题:计算问题(巧算速算)
分析:(1)(2)(4)利用乘法分配律简算;
(3)利用减法的性质简算;
(5)把算式变为[65×(
+
)]÷[5×(
+
)],利用除法的性质简算;
(6)先约分,再进一步计算即可.
(3)利用减法的性质简算;
(5)把算式变为[65×(
| 1 |
| 7 |
| 1 |
| 9 |
| 1 |
| 7 |
| 1 |
| 9 |
(6)先约分,再进一步计算即可.
解答:
解:(1)2014×0.1+2014×
=2014×(0.1+0.9)
=2014×1
=2014;
(2)(
+
)×19×23
=
×19×23+
×19×23
=69+38
=107;
(3)18
-(8
-1
)
=18
-8
+1
=10+1
=11
;
(4)
×27+
×41
=
×9+
×41
=
×(9+41)
=
×50
=30;
(5)(9
+7
)÷(
+
)
=[65×(
+
)]÷[5×(
+
)]
=[65×(
+
)÷5÷(
+
)
=13;
(6)
+
+
=
+
+
=
.
| 9 |
| 10 |
=2014×(0.1+0.9)
=2014×1
=2014;
(2)(
| 3 |
| 19 |
| 2 |
| 23 |
=
| 3 |
| 19 |
| 2 |
| 23 |
=69+38
=107;
(3)18
| 5 |
| 9 |
| 5 |
| 9 |
| 3 |
| 7 |
=18
| 5 |
| 9 |
| 5 |
| 9 |
| 3 |
| 7 |
=10+1
| 3 |
| 7 |
=11
| 3 |
| 7 |
(4)
| 1 |
| 5 |
| 3 |
| 5 |
=
| 3 |
| 5 |
| 3 |
| 5 |
=
| 3 |
| 5 |
=
| 3 |
| 5 |
=30;
(5)(9
| 2 |
| 7 |
| 2 |
| 9 |
| 5 |
| 7 |
| 5 |
| 9 |
=[65×(
| 1 |
| 7 |
| 1 |
| 9 |
| 1 |
| 7 |
| 1 |
| 9 |
=[65×(
| 1 |
| 7 |
| 1 |
| 9 |
| 1 |
| 7 |
| 1 |
| 9 |
=13;
(6)
| 1 |
| 31 |
| 303 |
| 3131 |
| 50505 |
| 313131 |
=
| 1 |
| 31 |
| 3 |
| 31 |
| 5 |
| 31 |
=
| 9 |
| 31 |
点评:此题考查分数、小数、整数的四则混合运算,抓住运算顺序,正确使用运算定律简算.
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