Odpowiedź:
A). 7a - 1/3a a=9
7*9 - 1/3*9=
= 63 - 3 = 60
b). 3b² + 2b b= -3
3b*3b +2b
3*(-3) * 3*(-3) + 2*(-3) =
= -9 * (-9) + (-6) =
= 81 - 6 = 75
C) (3x + 4y)(6-x) x=2 ; y= -3
(3*2 + 4*(-3)) * (6-2)=
= (6 + (-12)) * (4) =
= (6 - 12) * 4 =
= -6 * 4 = - 24
Liczę na naj :)