Решите уравнения:

(x+11) ²-x²=11

44+z² = (12+z) ²

69 - (13-y) ²=-y²

31-t² = - (t-9) ²

(x+11) ²-x²=11

x²+22 х + 121-x²=11

22 х+121=11

22 х=-110

х=-110/22=-5

44+z² = (12+z) ²

44+z² = 144+24z+z²

24z=44-144

24z=-100

z=-100/24=-25/6

69 - (13-y) ²=-y²

69-169+26y-y²=-y²

26y=100

y=100/26=50/13

31-t² = - (t-9) ²

31-t²=-t²+18t-81

18t=31+81

18t=112

t=112/18=56/9