Question

1

4

×（4.85÷

5

18

-3.6+6.15×3

3

5

）+[5.5-1.75×（1

2

3

+

19

21

）]=______．

Answer 1

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

）+[5.5-1.75×

18

7

]
=

1

4

×[3.6×（4.85-1+6.15）]+[5.5-

7

4

×

18

7

]
=

1

4

×3.6×10+[5.5-4.5]
=9+1
=10；
故答案为：10．