Bitte nachrechnen, weil ich schnell getippt habe:
(I) -3=-64a+16b-4c+d
(II) -11=-8a+4b-2c+d
(III) -0,5=1a+1b+1c+d
(IV) -17=64a+16b+4c+d
(I)-(II) 8=-56a+12b-2c → A) 4=-28a+6b-c
(III)-(IV) -16,5=-63a-15b-3c → B) -5,5=-21a-5b-c
(II)-(IV) 6=-72a-12b-6c → C) 1=-12a-2b-c
A) -B) 9,5=-7a+11b |*8 → D) 76=-56a+88b
A) -C) 3=-16a+8b |*11 → E) 33=-176a+88b
D)-E) 43=120a → a= \( \frac{43}{120} \) in D) 76= -56*\( \frac{43}{120} \)+88b
76= -7*\( \frac{43}{15} \)+88b
b=\( \frac{131}{120} \) und a= \( \frac{43}{120} \) in III) : -0,5= \( \frac{43}{120} \)+\( \frac{131}{120} \) +1c+d → -0,5=\( \frac{174}{120} \) +c+d → -0,5= \( \frac{87}{60} \) +c+d
u.s.w.