5 7,12 0,18.18 17,38( )ỎP ỎN

13,5 7,12 0,18.18 17,38( )

ỏp ỏn : C

Cõu 63:

+) ý t ng tỡm ra X r i ỏp d ng baot toàn kh i l ng:

C H

O N C H

O N nCO n  H O n M

      

A.A

2

1

2

3

6

1

4

3

3

2

6 1

2

3 (

AA

89)

n

n

n

n

2

      

BTKL

m

m m

0, 2.40 10,52 .18 9, 24

ỏp ỏn : D