题目内容

477×85-7784÷5628.5+3.14÷(5.128-4.5)×2.5
7
1
5
÷
18
25
-(
7
12
+2
5
8
)×2
5
14
[(
1
2
+
3
20
-
1
15
)×
12
49
÷3
3
7
]÷[1-1
7
8
÷15
]
1
5
7
×〔0.625+(4
1
6
-2
4
15
)÷(1.83+
9
20
)〕
(1)477×85-7784÷56,
=40545-139,
=40406;

(2)28.5+3.14÷(5.128-4.5)×2.5,
=28.5+3.14÷0.628×2.5,
=28.5+5×2.5,
=28.5+12.5,
=41;

(3)7
1
5
÷
18
25
-(
7
12
+2
5
8
)×2
5
14

=7
1
5
÷
18
25
-
77
24
×2
5
14

=10-
121
16

=
39
16
,;

(4)[(
1
2
+
3
20
-
1
15
)×
12
49
÷3
3
7
]÷[1-1
7
8
÷15
],
=[(
13
20
-
1
15
)×
12
49
÷3
3
7
]÷[1-
1
8
],
=[
7
12
×
12
49
÷3
3
7
7
8

=[
1
7
÷3
3
7
7
8

=
1
24
÷
7
8

=
1
21


(5)1
5
7
×〔0.625+(4
1
6
-2
4
15
)÷(1.83+
9
20
)〕,
=1
5
7
×〔0.625+
19
10
÷2.28〕,
=1
5
7
×〔0.625+
95
114
〕,
=1
5
7
×
405
456

=
405
266
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