题目内容
(2012?中山市模拟)计算[(10.75-4
)×2
]÷[(1.125+
)÷(2.25÷10
]=
.
| 11 |
| 12 |
| 7 |
| 11 |
| 1 |
| 12 |
| 10 |
| 11 |
| 21 |
| 8 |
| 21 |
| 8 |
分析:本题有两个中括号,两个中括号同时进行计算,都要先算小括号内的,再算中括号内的,在运算过程中,可以运用除法的性质,进行简算.
解答:解:[(10.75-4
)×2
]÷[(1.125+
)÷(2.25÷10
],
=[(10
-4
)×2
]÷[(1
+
)÷(2
÷10
],
=[(10
-4
)×2
]÷[(1
+
)÷(
×
],
=
×
÷[
÷
],
=
×
÷[
×
],
=
×
×
×
,
=
.
故答案为:
.
| 11 |
| 12 |
| 7 |
| 11 |
| 1 |
| 12 |
| 10 |
| 11 |
=[(10
| 3 |
| 4 |
| 11 |
| 12 |
| 7 |
| 11 |
| 1 |
| 8 |
| 1 |
| 12 |
| 1 |
| 4 |
| 10 |
| 11 |
=[(10
| 9 |
| 12 |
| 11 |
| 12 |
| 7 |
| 11 |
| 3 |
| 24 |
| 2 |
| 24 |
| 9 |
| 4 |
| 11 |
| 120 |
=
| 35 |
| 6 |
| 29 |
| 11 |
| 29 |
| 24 |
| 33 |
| 160 |
=
| 35 |
| 6 |
| 29 |
| 11 |
| 29 |
| 24 |
| 160 |
| 33 |
=
| 35 |
| 6 |
| 29 |
| 11 |
| 24 |
| 29 |
| 33 |
| 160 |
=
| 21 |
| 8 |
故答案为:
| 21 |
| 8 |
点评:此题计算量较大,应按运算顺序一步步进行.重点考查学生对运算顺序的掌握,以及仔细计算的能力.
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