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1)Solutoa intreaga a ecuatiei:2(x-3)=5x+9
2)a x b+a x c=-27
a=9
b+c=?

Răspuns :

Andreutzakriss
2(x-3)=5x+9
2x-6=5x+9
2x-5x=9+6
-3x=15
x=-15/3
x=-5

a•b+a•c=-27
a=9
a(b+c)=-27
9(b+c)=-27
b+c=-27/9
b+c=-3

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