题目内容

直接写出得数:
(1)[0.85-(
1
3
-0.15)]÷
28
5
                        
(2)[(7
2
7
+2.4÷6
1
5
)+2
2
3
]×5
(3)
1
2
×(17×
8
15
-
3
4
)-(12
7
12
-3
3
5
-2
1
3
(1)[0.85-(
1
3
-0.15)]÷
28
5

=[0.85+0.15-
1
3
5
28

=
=
2
3
×
5
28

=
5
42


(2)[(7
2
7
+2.4÷6
1
5
)+2
2
3
]×5,
=[
51
7
+
2.4×
5
31
+
8
3
]×5,
=[
51
7
+
12
31
+
8
3
]×5,
=[
4743
651
+
252
651
+
1736
651
]×5,
=
6731
651
×5,
=
33655
651

=51
454
651



(3)
1
2
×(17×
8
15
-
3
4
)-(12
7
12
-3
3
5
-2
1
3
),
=(
1
2
×17×
8
15
-
1
2
×
3
4
)-(12
7
12
-3
3
5
-2
1
3
),
=
68
15
-
3
8
-12
7
12
+3
3
5
+2
1
3

=4
8
15
+3
9
15
+2
5
15
-12
7
12
-
3
8

=10
7
15
-12
70
120
-
45
120

=10
56
120
-(12
70
120
+
45
120
),
=9
176
120
-12
115
120

=-3
61
120
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