题目内容
(2008?扬州)计算下列各题(能简算的写出简算过程)
+
+6.875+
÷
+
×
÷(
-
)×
4.82-5.2÷0.8×0.6.
| 1 |
| 8 |
| 5 |
| 7 |
| 2 |
| 7 |
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
| 1 |
| 3 |
| 2 |
| 3 |
| 2 |
| 5 |
| 3 |
| 5 |
分析:(1)先把6.875化成6
,在运用加法的结合律及交换律进行计算,这样使计算更加简便,
(2)先计算除以
变为乘以
,在运用除法的分配律进行计算,
(3)先通分计算小括号内部的,然后再根据分数乘除法的计算法则进行计算,
(4)按照小数的四则混合运算顺序进行计算.
| 7 |
| 8 |
(2)先计算除以
| 11 |
| 5 |
| 5 |
| 11 |
(3)先通分计算小括号内部的,然后再根据分数乘除法的计算法则进行计算,
(4)按照小数的四则混合运算顺序进行计算.
解答:解:(1)
+
+6.875+
,
=
+
+6
+
,
=(
+6
)+(
+
),
=7+1,
=8;
(2)
÷
+
×
,
=
×
+
×
,
=
×(
+
),
=
×1,
=
;
(3)
÷(
-
)×
,
=
÷(
-
)×
,
=
÷
×
,
=
×
×
,
=
;
(4)4.82-5.2÷0.8×0.6,
=4.82-6.5×0.6,
=4.82-3.9,
=0.92.
| 1 |
| 8 |
| 5 |
| 7 |
| 2 |
| 7 |
=
| 1 |
| 8 |
| 5 |
| 7 |
| 7 |
| 8 |
| 2 |
| 7 |
=(
| 1 |
| 8 |
| 7 |
| 8 |
| 5 |
| 7 |
| 2 |
| 7 |
=7+1,
=8;
(2)
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
=
| 7 |
| 9 |
| 5 |
| 11 |
| 2 |
| 9 |
| 5 |
| 11 |
=
| 5 |
| 11 |
| 7 |
| 9 |
| 2 |
| 9 |
=
| 5 |
| 11 |
=
| 5 |
| 11 |
(3)
| 1 |
| 3 |
| 2 |
| 3 |
| 2 |
| 5 |
| 3 |
| 5 |
=
| 1 |
| 3 |
| 10 |
| 15 |
| 6 |
| 15 |
| 3 |
| 5 |
=
| 1 |
| 3 |
| 4 |
| 15 |
| 3 |
| 5 |
=
| 1 |
| 3 |
| 15 |
| 4 |
| 3 |
| 5 |
=
| 3 |
| 4 |
(4)4.82-5.2÷0.8×0.6,
=4.82-6.5×0.6,
=4.82-3.9,
=0.92.
点评:完成本题要注意分析式中数据,运用合适的简便方法计算.
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