oblicz wartosc wyrazen dla x=3 y=2 a/ 2x-5+6x= b/ 5x-6-12x c/ 2x-3y= d/ 5y-25=

A) 2 x 3 - 5 + 6 x 3 = 6 - 5 + 18 = 19 B) 5 x 3 - 6 - 12 x 3 = 15 - 6 - 36 = 15 - 42 = (- 27) C) 2 x 3 - 3 x 2 = 0 D) 5 x 2 - 25 = 10 - 25 = (-15)

[latex]a).2x-5+6x=8x-5 =8*3-5=24-5=19 \ \ b).5x-6-12x=-7x-6=-7*3-6=-21-6=-27 \ \ c).2x-3y=2*3-3*2=6-6=0 \ \ d).5y-25=5*2-25=10-25=-15[/latex]