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Virgil202000
a fost răspuns

Dau coroana !!
Calculati nr x,stiind ca a-b=6 si :
a) x+3*a -3*b=20
b) x*a-x*b+9a -9b=654
c) 7*a-7*b+x=55

Răspuns :

a) x+3*(a-b)=20=>x+3*6=20=>x=2

b) x*(a-b)+9*(a-b)=654=>x*6+9*6=654=>6*x=600=>x=100

c) 7*(a-b)+x=55=>7*6+x=55=>x=13