题目内容
脱式计算(能简算的要简算)
12×(
+
-
)
(0﹒75+
)÷(
+
)
19﹒6×0﹒1+9×1﹒96
2010×
-(
-
)-
2﹒5×
+8﹒5×60%-0﹒6.
12×(
| 5 |
| 6 |
| 1 |
| 2 |
| 1 |
| 3 |
(0﹒75+
| 3 |
| 16 |
| 2 |
| 7 |
| 1 |
| 14 |
19﹒6×0﹒1+9×1﹒96
2010×
| 3 |
| 2011 |
| 6 |
| 7 |
| 3 |
| 4 |
| 1 |
| 7 |
| 1 |
| 4 |
2﹒5×
| 3 |
| 5 |
考点:整数、分数、小数、百分数四则混合运算
专题:运算顺序及法则
分析:(1)根据乘法分配律简算即可;
(2)根据分数、小数四则运算的方法计算即可;
(3)根据乘法分配律简算即可;
(4)根据乘法分配律、加法交换律和加法结合律计算即可;
(5)根据乘法分配律简算即可.
(2)根据分数、小数四则运算的方法计算即可;
(3)根据乘法分配律简算即可;
(4)根据乘法分配律、加法交换律和加法结合律计算即可;
(5)根据乘法分配律简算即可.
解答:
解:(1)12×(
+
-
)
=12×
+12×
-12×
=10+6-4
=12
(2)(0﹒75+
)÷(
+
)
=(
+
)÷(
+
)
=
÷
=2
(3)19﹒6×0﹒1+9×1﹒96
=19﹒6×0﹒1+0.9×19.6
=19﹒6×(0﹒1+0.9)
=19.6×1
=19.6
(4)2010×
+
-(
-
)-
=(2011-1)×
+(
+
)-(
+
)
=3-
+1-1
=2
(5)2﹒5×
+8﹒5×60%-0﹒6
=2﹒5×0.6+8﹒5×0.6-0﹒6
=(2﹒5+8﹒5-1)×0﹒6
=10×0.6
=6
| 5 |
| 6 |
| 1 |
| 2 |
| 1 |
| 3 |
=12×
| 5 |
| 6 |
| 1 |
| 2 |
| 1 |
| 3 |
=10+6-4
=12
(2)(0﹒75+
| 3 |
| 16 |
| 2 |
| 7 |
| 1 |
| 14 |
=(
| 3 |
| 4 |
| 3 |
| 16 |
| 4 |
| 14 |
| 1 |
| 14 |
=
| 15 |
| 16 |
| 5 |
| 14 |
=2
| 5 |
| 8 |
(3)19﹒6×0﹒1+9×1﹒96
=19﹒6×0﹒1+0.9×19.6
=19﹒6×(0﹒1+0.9)
=19.6×1
=19.6
(4)2010×
| 3 |
| 2011 |
| 6 |
| 7 |
| 3 |
| 4 |
| 1 |
| 7 |
| 1 |
| 4 |
=(2011-1)×
| 3 |
| 2011 |
| 6 |
| 7 |
| 1 |
| 7 |
| 3 |
| 4 |
| 1 |
| 4 |
=3-
| 3 |
| 2011 |
=2
| 2008 |
| 2011 |
(5)2﹒5×
| 3 |
| 5 |
=2﹒5×0.6+8﹒5×0.6-0﹒6
=(2﹒5+8﹒5-1)×0﹒6
=10×0.6
=6
点评:此题主要考查了乘法运算定律、加法运算定律在简算中的应用.
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