题目内容
递等式计算.
(1)8×
+
÷4 (2)(
-
)÷
+
(3)
÷(
+
×
) (4)[1-(
-
)]÷
.
(1)8×
| 5 |
| 6 |
| 2 |
| 5 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2 |
| 5 |
| 6 |
(3)
| 5 |
| 8 |
| 1 |
| 6 |
| 3 |
| 4 |
| 5 |
| 6 |
| 3 |
| 5 |
| 3 |
| 10 |
| 7 |
| 8 |
分析:根据分数四则混合运算的法则,先算乘除后算加减,有括号的先算括号里面的.
解答:解:(1)8×
+
÷4,
=
+
,
=6
,
(2)(
-
)÷
+
,
=
÷
+
,
=
+
,
=1,
(3)
÷(
+
×
),
=
÷(
+
),
=
÷
,
=
,
(4)[1-(
-
)]÷
,
=(1-
)÷
,
=
÷
,
=
.
| 5 |
| 6 |
| 2 |
| 5 |
=
| 20 |
| 3 |
| 1 |
| 10 |
=6
| 23 |
| 30 |
(2)(
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2 |
| 5 |
| 6 |
=
| 1 |
| 12 |
| 1 |
| 2 |
| 5 |
| 6 |
=
| 1 |
| 6 |
| 5 |
| 6 |
=1,
(3)
| 5 |
| 8 |
| 1 |
| 6 |
| 3 |
| 4 |
| 5 |
| 6 |
=
| 5 |
| 8 |
| 1 |
| 6 |
| 5 |
| 8 |
=
| 5 |
| 8 |
| 19 |
| 24 |
=
| 15 |
| 19 |
(4)[1-(
| 3 |
| 5 |
| 3 |
| 10 |
| 7 |
| 8 |
=(1-
| 3 |
| 10 |
| 7 |
| 8 |
=
| 7 |
| 10 |
| 7 |
| 8 |
=
| 4 |
| 5 |
点评:此题考查了分数的四则混合运算.
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