122 



EL ClLCULO 



la = 7 



3a - c =0 



5a + b — 2d = 6 



6-c =0 



b-d =2 



7 0=7 

 30-1 0=0 

 5 1 0-2=6 

 1-1 0=0 



1 



2 



4=1 

 6 



£2 



c= 6 

 d= 4 



7 















3 

 5 



0- 



1 



1 

 0-2 



= 7 



10-2 

 1- 10 







1 - 



• 1 







= 7 



: 7 (- 1 + 2) - 7 



7 



0-1 



6 5 0-2 



1-1 



! 0- 10 





0- 1 



= 7 i 



1-10 



= 7 



1 - 1 



= 7 (0+ 1) =7 



7 7 

 3 o 

 









77 





77 



1 



= — 2 



30 



= — >A 



30 



s 











2(0 --21) =42 



G H 3 



.CO.O- 7 Ca -h Ca (OH) 2 = 2 CH 4 + 2 GO' Ca 



4a — c =1 



6a + 26 - 4c = 



4a + 26 =3 



a + b =1 



b 



c 



d 



4 



0-1 = 1 



n -i 



a „ij; 



6 



2-4 = 



b ===| 



4 



2 = 3 



c = 



1 



1 = 1 



d = 



6 2-4 





49, 



4 2 



= -4 



11 



1 1 







= -8(4-2) = 



