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calculati ab+ac /15 stiind ca a=9 si b+c=25

Răspuns :

(ab+ac)/15= a(b+c)/15=  9*25/15=  9*5/3=  3*5=15
a = 9
b + c = 25

[tex] \frac{ab+ac}{15}= \frac{a(b+c)}{15}= \frac{9*25}{15}= \frac{225}{15}= \frac{ 15^{2} }{15^{1}}= 15^{2-1}= 15^{1}=15 [/tex]