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daca a x (b+c)=300 . a x c =160 . b = 28 afla a x 100

Răspuns :

a*b+a*c = 300
a*b + 160 = 300
a*b = 300-160
a*b = 140
a*28 = 140
a = 140:28
a = 5
a*100 = 5*100 = 500
a•b+a•c=300
a•b+160=300
a•b=300-160
a•b=140
a•28=140
a=140:28
a=5