题目内容
脱式计算
÷(
×
÷
)
2÷3+
×
-1
-
-
1+0.45÷0.9-
.
| 20 |
| 29 |
| 1 |
| 2 |
| 6 |
| 29 |
| 3 |
| 20 |
2÷3+
| 3 |
| 2 |
| 4 |
| 9 |
| 9 |
| 10 |
| 2 |
| 5 |
| 1 |
| 3 |
1+0.45÷0.9-
| 3 |
| 4 |
分析:按照分数、小数混合运算的顺序进行计算,能简算的要简算.
解答:解;(1)
÷(
×
÷
),
=
÷(
×
),
=1;
(2)2÷3+
×
-1,
=
+
-1,
=
;
(3)
-
-
,
=
-
,
=
;
(4)1+0.45÷0.9-
,
=1+
-
,
=
.
| 20 |
| 29 |
| 1 |
| 2 |
| 6 |
| 29 |
| 3 |
| 20 |
=
| 20 |
| 29 |
| 3 |
| 29 |
| 20 |
| 3 |
=1;
(2)2÷3+
| 3 |
| 2 |
| 4 |
| 9 |
=
| 2 |
| 3 |
| 2 |
| 3 |
=
| 1 |
| 3 |
(3)
| 9 |
| 10 |
| 2 |
| 5 |
| 1 |
| 3 |
=
| 1 |
| 2 |
| 1 |
| 3 |
=
| 1 |
| 6 |
(4)1+0.45÷0.9-
| 3 |
| 4 |
=1+
| 1 |
| 2 |
| 3 |
| 4 |
=
| 3 |
| 4 |
点评:此题考查分数、小数混合运算的顺序,按照分数、小数混合运算的顺序进行计算,能简算的要简算.
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