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Fie numerele rationale a,b,c,d
Daca a*b=(2 supra 15) si a*c=(11 supra 75) calculati a*(b+c)


Răspuns :

a*(b+c)=  ab+ac
 
=  2/15 + 11/75=

=(10+11)/75= 21/75= 7/25
a*b=2/15
a*c=11/75
a*(b+c)=a*b+a*c=2/15+11/75=10+11/75=21/75=7/25