题目内容

(7
5
18
-6
11
15
)÷[2
14
15
+(4-2
1
15
)÷1.45].
(7
5
18
-6
11
15
)÷[2
14
15
+(4-2
1
15
)÷1.45],
=(7
25
90
-6
66
90
)÷[2
14
15
+1
14
15
÷1
9
20
],
=
49
90
÷[2
14
15
+
29
15
×
20
29
],
=
49
90
÷[2
14
15
+
20
15
],
=
49
90
÷
64
15

=
49
90
×
15
64

=
49
384
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