题目内容
20.6-(6.6+
÷12.5%)
÷[
×(60%-25%)]
36÷[(
-
)÷
]
60×[(
+
)÷
]
1÷(
×
)×
÷5+
×
.
| 1 |
| 8 |
| 1 |
| 3 |
| 4 |
| 7 |
36÷[(
| 2 |
| 3 |
| 2 |
| 5 |
| 3 |
| 5 |
60×[(
| 2 |
| 3 |
| 2 |
| 5 |
| 3 |
| 5 |
1÷(
| 1 |
| 10 |
| 10 |
| 9 |
| 4 |
| 9 |
| 3 |
| 10 |
| 1 |
| 5 |
| 7 |
| 10 |
分析:(1)根据题意,可把12.5%改写乘0.125,把
改写成小数,然后再按照小数四则混合运算的运算顺序进行计算即可;
(2)根据题意,可把算式中的百分数改写成分数,然后再按照分数四则混合运算,先计算小括号内的减法,再计算中括号内的乘法,最后再计算除法即可;
(3)根据题意,按照分数四则混合运算的运算顺序,可先计算小括号内的减法,再计算中括号的除法,最后再计算中括号外的除法法即可;
(4)根据题意,按照分数四则混合运算的运算顺序,可先计算小括号内的加法,再计算中括号的除法,最后再计算中括号外的乘法即可;
(5)根据题意,可先计算小括号内的乘法,再计算括号外的除法,最后再计算乘法即可;
(6)根据题意,可利用分数四则混合运算的运算顺序,先计算除法、乘法,然后再计算加法即可.
| 1 |
| 8 |
(2)根据题意,可把算式中的百分数改写成分数,然后再按照分数四则混合运算,先计算小括号内的减法,再计算中括号内的乘法,最后再计算除法即可;
(3)根据题意,按照分数四则混合运算的运算顺序,可先计算小括号内的减法,再计算中括号的除法,最后再计算中括号外的除法法即可;
(4)根据题意,按照分数四则混合运算的运算顺序,可先计算小括号内的加法,再计算中括号的除法,最后再计算中括号外的乘法即可;
(5)根据题意,可先计算小括号内的乘法,再计算括号外的除法,最后再计算乘法即可;
(6)根据题意,可利用分数四则混合运算的运算顺序,先计算除法、乘法,然后再计算加法即可.
解答:解:(1)20.6-(6.6+
÷12.5%)
=20.6-(6.60+0.125÷0.125)
=20.6-(6.6+1)
=20.6-7.6
=13;
(2)
÷[
×(60%-25%)]
=
÷[
×35%]
=
÷
=1
;
(3)36÷[(
-
)÷
]
=36÷[
÷
]
=36÷
=81;
(4)60×[(
+
)÷
]
=60×[
÷
]
=60×
=106
;
(5)1÷(
×
)×
=1÷
×
=9×
=4;
(6)
÷5+
×
=
+
=
.
| 1 |
| 8 |
=20.6-(6.60+0.125÷0.125)
=20.6-(6.6+1)
=20.6-7.6
=13;
(2)
| 1 |
| 3 |
| 4 |
| 7 |
=
| 1 |
| 3 |
| 4 |
| 7 |
=
| 1 |
| 3 |
| 1 |
| 5 |
=1
| 2 |
| 3 |
(3)36÷[(
| 2 |
| 3 |
| 2 |
| 5 |
| 3 |
| 5 |
=36÷[
| 4 |
| 15 |
| 3 |
| 5 |
=36÷
| 4 |
| 9 |
=81;
(4)60×[(
| 2 |
| 3 |
| 2 |
| 5 |
| 3 |
| 5 |
=60×[
| 16 |
| 15 |
| 3 |
| 5 |
=60×
| 16 |
| 9 |
=106
| 2 |
| 3 |
(5)1÷(
| 1 |
| 10 |
| 10 |
| 9 |
| 4 |
| 9 |
=1÷
| 1 |
| 9 |
| 4 |
| 9 |
=9×
| 4 |
| 9 |
=4;
(6)
| 3 |
| 10 |
| 1 |
| 5 |
| 7 |
| 10 |
=
| 3 |
| 50 |
| 7 |
| 50 |
=
| 1 |
| 5 |
点评:此题主要考查的整数、分数、小数四则混合运算顺序的应用.
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