问题 解答题
4920÷24-17×120.25×6.7×4
168.1÷(4.3×2-0.4)
2
3
-(
5
6
-
3
4
3
8
5
4
×
8
9
-
1
4
×
8
9
15
7
÷[(1-
5
8
2
8
]
答案

(1)4920÷24-17×12,

=205-204,

=1;

(2)0.25×6.7×4,

=0.25×4×6.7,

=1×6.7,

=6.7;

(3)168.1÷(4.3×2-0.4),

=168.1÷(8.6-0.4),

=168.1÷8.2,

=20.5;

(4)

2
3
-(
5
6
-
3
4
÷
3
8

=

2
3
-
1
12
÷
3
8

=

2
3
-
2
9

=

4
9

(5)

5
4
×
8
9
-
1
4
×
8
9

=(

5
4
-
1
4
)×
8
9

=1×

8
9

=

8
9

(6)

15
7
÷[(1-
5
8
2
8
],

=

15
7
÷[
3
8
÷
2
8
],

=

15
7
÷
3
2

=

10
7

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