题目内容
[(1
×2+2.5)÷
-2
]÷16.
| 2 |
| 3 |
| 7 |
| 8 |
| 1 |
| 5 |
分析:先算小括号内的乘法,再算小括号内的加法,然后算中括号内的除法,再算中括号内的减法,最后算括号外的除法.
解答:解:[(1
×2+2.5)÷
-2
]÷16,
=[(
+
)÷
-2
]÷16,
=[
×
-2
]÷16,
=[
-2
]÷16,
=
×
,
=
.
| 2 |
| 3 |
| 7 |
| 8 |
| 1 |
| 5 |
=[(
| 10 |
| 3 |
| 5 |
| 2 |
| 7 |
| 8 |
| 1 |
| 5 |
=[
| 35 |
| 6 |
| 8 |
| 7 |
| 1 |
| 5 |
=[
| 20 |
| 3 |
| 1 |
| 5 |
=
| 67 |
| 15 |
| 1 |
| 16 |
=
| 67 |
| 240 |
点评:考查了分数、小数的四则混合运算,注意运算顺序和运算法则,同时注意数字转化.
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