Question

Fie numerele rationale a,b,c,d:a)daca a*b= 2 supra 15 si a*c 11 supra Fie numerele rationale a,b,c,d: a)daca a*b= 2 supra 15 si a*c 11 supra 75,calculati a*(b+c) b)Daca a*c= 7 supra 36 si b*c= 19 supra 48 calculati c*(b-a) c)Daca a= 5 supra 6,b+c=7 supra 20 si c-d= 1 supra 24,calculati a*b+2*a*c-a*d Ajutor va rog! :*

Answer 1

a) a*(b+c)=a*b+a*c=2/15+11/75=(2*5+11)/75=21/75
b)c*(b-a)=b*c-a*c=19/48-7/36=(19*3-7*4)/144=29/144
c)a*b+2*a*c-a*d=a*(b+c)+a(c-d)=5*7/20+5*1/24=7/4+5/24=(42+5)/24=47/24