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(2x+4)+(2x+6)= ? cum fac
6x+3=-3x-12 ?
51+2(16-3)+3:(9+8) ?


Răspuns :

(2x+4)+(2x+6)= (2(x+2))+(2(x+3)) = 2(x+2)+2(+3) = 2(x+2+x+3) = 2(2x+5)

6x+3=-3x-12 =) 6x+3x = -12-3 =) 9x = -15 = ) x = -5/3

51+2(16-3)+3:(9+8) = 51+2*13+3:17 =

= 51+26 +3/17 =

= 77+3/17 = 

= (1309+3)/17 = 1312/17