题目内容
下面各题,怎样算简便就怎样算:
÷(
-
)×
×(
+
)+
÷
+
×
.
| 1 |
| 3 |
| 2 |
| 3 |
| 2 |
| 5 |
| 3 |
| 5 |
| 12 |
| 15 |
| 5 |
| 6 |
| 3 |
| 4 |
| 4 |
| 5 |
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
分析:(1)(2)先算括号内的,然后从左往右依次运算;
(3)先算除法和乘法,再算加法.
(3)先算除法和乘法,再算加法.
解答:解:(1)
÷(
-
)×
,
=
÷
×
,
=
×
×
,
=
;
(2)
×(
+
)+
,
=
×
+
,
=
+
,
=
;
(3)
÷
+
×
,
=
×
+
×
,
=(
+
)×
,
=1×
,
=
.
| 1 |
| 3 |
| 2 |
| 3 |
| 2 |
| 5 |
| 3 |
| 5 |
=
| 1 |
| 3 |
| 4 |
| 15 |
| 3 |
| 5 |
=
| 1 |
| 3 |
| 15 |
| 4 |
| 3 |
| 5 |
=
| 3 |
| 4 |
(2)
| 12 |
| 15 |
| 5 |
| 6 |
| 3 |
| 4 |
| 4 |
| 5 |
=
| 12 |
| 15 |
| 19 |
| 12 |
| 4 |
| 5 |
=
| 19 |
| 15 |
| 4 |
| 5 |
=
| 31 |
| 15 |
(3)
| 7 |
| 9 |
| 11 |
| 5 |
| 2 |
| 9 |
| 5 |
| 11 |
=
| 7 |
| 9 |
| 5 |
| 11 |
| 2 |
| 9 |
| 5 |
| 11 |
=(
| 7 |
| 9 |
| 2 |
| 9 |
| 5 |
| 11 |
=1×
| 5 |
| 11 |
=
| 5 |
| 11 |
点评:此题考查了分数的四则混合运算,注意运算顺序和运算法则.
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