a) a²-3a+1= a = -4 b) 1+x*(x+4)= x = -11 c) x-2y = x = 1 y = -1 dzięki .

a) a²-3a+1= a = -4 -4² - 3*(-4) + 1 = -16 + 12 + 1 = -3 b) 1+x*(x+4)= x = -11 1 + (-11)*(-11+4) = 1 + (-11)*(-7) = 1 + 77 = 78 c) x-2y = x = 1 y = -1 1 - 2*(-1) = 1 + 2 = 3

a²-3a+1=-4²-3(-4)+1=16+12+1=29 1+x*(x+4)= 1+(-11²)×(-11+4)= 1+121×(-7)=122×(-7)=-854 x-2y =1-2(-1)=1+2=3