题目内容
(2
+1
×5)÷3
-1
.
| 2 |
| 5 |
| 1 |
| 3 |
| 2 |
| 5 |
| 1 |
| 3 |
分析:先算括号内的乘法,再算括号内的加法,然后算括号外的除法,最后算减法.
解答:解:(2
+1
×5)÷3
-1
,
=(2
+6
)÷3
-1
,
=
×
-1
,
=2
-1
,
=1
.
| 2 |
| 5 |
| 1 |
| 3 |
| 2 |
| 5 |
| 1 |
| 3 |
=(2
| 2 |
| 5 |
| 2 |
| 3 |
| 2 |
| 5 |
| 1 |
| 3 |
=
| 136 |
| 15 |
| 5 |
| 17 |
| 1 |
| 3 |
=2
| 2 |
| 3 |
| 1 |
| 3 |
=1
| 1 |
| 3 |
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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