题目内容
脱式计算,能简算的要简算.
(1)0.95×
+
×0.95
(2)
-
-
+
(3)10000÷25÷8÷4
(4)
+
-1.625-2.375+3.
(1)0.95×
| 2 |
| 7 |
| 5 |
| 7 |
(2)
| 5 |
| 19 |
| 13 |
| 17 |
| 4 |
| 17 |
| 14 |
| 19 |
(3)10000÷25÷8÷4
(4)
| 5 |
| 9 |
| 7 |
| 9 |
分析:(1)根据乘法分配律进行简算;
(2)根据加法交换律和结合律以及减法的性质进行简算;
(3)根据除法的性质进行简算;
(4)根据加法交换律和结合律以及减法的性质进行简算.
(2)根据加法交换律和结合律以及减法的性质进行简算;
(3)根据除法的性质进行简算;
(4)根据加法交换律和结合律以及减法的性质进行简算.
解答:解:
(1)0.95×
+
×0.95,
=0.95×(
+
),
=0.95;
(2)
-
-
+
,
=(
+
)-(
+
),
=1-1,
=0;
(3)10000÷25÷8÷4,
=10000÷(25×8×4),
=10000÷800,
=12.5;
(4)
+
-1.625-2.375+3,
=(
+
+3)-(1.625+2.375),
=4
-4,
=
.
(1)0.95×
| 2 |
| 7 |
| 5 |
| 7 |
=0.95×(
| 2 |
| 7 |
| 5 |
| 7 |
=0.95;
(2)
| 5 |
| 19 |
| 13 |
| 17 |
| 4 |
| 17 |
| 14 |
| 19 |
=(
| 5 |
| 19 |
| 14 |
| 19 |
| 13 |
| 17 |
| 4 |
| 17 |
=1-1,
=0;
(3)10000÷25÷8÷4,
=10000÷(25×8×4),
=10000÷800,
=12.5;
(4)
| 5 |
| 9 |
| 7 |
| 9 |
=(
| 5 |
| 9 |
| 7 |
| 9 |
=4
| 1 |
| 3 |
=
| 1 |
| 3 |
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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