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[
4
11
×(
2
3
+
19
21
)-
3
8
]÷1
1
7
分析:我们按照四则混合运算的剩下进行计算,先计算中括号内部的小括号,再就是中括号内部的,最后计算中括号外面的.
解答:解:[
4
11
×(
2
3
+
19
21
)-
3
8
]÷1
1
7

=[
4
11
×
33
21
-
3
8
]÷1
1
7

=[
4
7
-
3
8
7
8

=
4
7
×
7
8
-
3
8
×
7
8

=
1
2
-
21
64

=
32
64
-
21
64

=
11
64
点评:本题按照正确的运算顺序,运用分数的加减,乘除法的计算法则进行计算即可.
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