题目内容

计算:
(1)[2
1
7
-(8.5-2
1
8
)÷3.5]×7
5
12

(2)[47-(18.75-1÷
24
31
)×2
5
37
]÷0.46.
(1)[2
1
7
-(8.5-2
1
8
)÷3.5]×7
5
12

=[2
1
7
-(8
1
2
-2
1
8
)÷
7
2
]×7
5
12

=(
15
7
-
51
8
×
2
7
)×
89
12

=(
60
28
-
51
28
)×
89
12

=
9
28
×
89
12

=2
43
112


(2)[47-(18.75-1÷
24
31
)×2
5
37
]÷0.46,
=[47-(18
3
4
-1×
31
24
)×2
5
37
23
50

=[47-(
75
4
-
31
24
)×
79
37
50
23

=(47-
419
24
×
79
37
)×
50
23

=(47-
33101
888
)×
50
23

=
8635
888
×
50
23

=
215875
10212

=21
1423
10212
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