Rozwiązane

(12a+8b):4= (20x+16y-8):2= 4x+8dla x =5 4×5+8= 2x+3dla x = -3

Odpowiedź :

AstraySpirit2308viz

1)

[tex](12a+8b):4=12a:4+8b:4=\boxed{3a+2b}\\[/tex]

2)

[tex](20x+16y-8):2=20x:2+16y:2-8:2=\boxed{10x+8y-4}\\[/tex]

3)

[tex]x=5\\\\4x+5=4\cdot5+8=20+8=\boxed{28}[/tex]

4)

[tex]x=-3\\\\2x+3=2\cdot(-3)+3=-6+3=-(6-3)=\boxed{-3}[/tex]