1

4

×（4.85÷

5

18

-3.6+6.15×3

3

5

）+[5.5-1.75×（1

2

3

+

19

21

）]
=

1

4

×（4.85×

18

5

-3.6+6.15×

18

5

）+[5.5-

7

4

×

54

21

]
=

1

4

×（17.46-3.6+22.14）+[5.5-

9

2

]
=

1

4

×36+1
=9+1
=10
故答案为：10．