题目内容
(2010?尤溪县模拟)(1)(2.65-1
)÷[(4.5-3
)×0.48]
(2)27.27-3.8×2.4+3.18÷0.12
(3)(1
+2
+2
)÷(1-
)
(4)[67.5÷(1
)-144
]×1
.
| 1 |
| 4 |
| 1 |
| 3 |
(2)27.27-3.8×2.4+3.18÷0.12
(3)(1
| 3 |
| 8 |
| 2 |
| 5 |
| 5 |
| 8 |
| 3 |
| 35 |
(4)[67.5÷(1
| 4 |
| 5-1.35 |
| 3 |
| 4 |
| 3 |
| 7 |
分析:有括号的算式,要先算括号里面,再算括号外面的,没有括号时,要先算乘除法,后算加减法.
解答:解:(1)(2.65-1
)÷[(4.5- 3
)×0.48]
=
÷[
×
]
=
×
=
;
(2)27.27-3.8×2.4+3.18÷0.12(1)
=27.27-9.12+26.5
=18.15+26.5
=44.65;
(3)(1
+2
+ 2
)÷(1-
)
=(1
+ 2
+2
)×
=
×
=7;
(4)[67.5÷(1
)-144
]×1
=[
÷ 1
-144
]×
=[32
-144
]×
=-
×
=-160
.
| 1 |
| 4 |
| 1 |
| 3 |
=
| 7 |
| 5 |
| 7 |
| 6 |
| 12 |
| 25 |
=
| 7 |
| 5 |
| 25 |
| 14 |
=
| 5 |
| 2 |
(2)27.27-3.8×2.4+3.18÷0.12(1)
=27.27-9.12+26.5
=18.15+26.5
=44.65;
(3)(1
| 3 |
| 8 |
| 2 |
| 5 |
| 5 |
| 8 |
| 3 |
| 35 |
=(1
| 15 |
| 40 |
| 16 |
| 40 |
| 25 |
| 40 |
| 35 |
| 32 |
=
| 256 |
| 40 |
| 35 |
| 32 |
=7;
(4)[67.5÷(1
| 4 |
| 5-1.35 |
| 3 |
| 4 |
| 3 |
| 7 |
=[
| 135 |
| 2 |
| 80 |
| 73 |
| 3 |
| 4 |
| 10 |
| 7 |
=[32
| 7 |
| 34 |
| 3 |
| 4 |
| 10 |
| 7 |
=-
| 7653 |
| 68 |
| 10 |
| 7 |
=-160
| 185 |
| 238 |
点评:此题考查整数、分数,小数四则混合运算的运算顺序,是考查学生的计算能力.
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