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równanie kwadratowe, obliczasz deltę
delta = b^2-4ac =( -1)^2 -4*(1,2*0,2) = 1-0,96 = 0,04
V0,04 = 0,2
x2 = (-b-Vdelty)/2a = (1-0,2)/0,4 =0,8/0,4 =2
x2 = (-b+Vdelty)/2a = (1+0,2)/0,4 = 1,2/0,4 =3
V- PIERWIASTEK