Ответ:
-(-x-5y)'2+22xy+(3y-2x)'2=-(x'2+10xy+25y'2)+22xy+9y'2-12xy+4x'2=
-x'2-10xy-25y'2+10xy+9y'2+4x'2=
=-x'2+4x'2-25y'2+9y'2=3x'2-16y'2=
=3*9-16*4=27-64=-37
10^3=1000
10^2=100
8.8*1000+5.5*100=8800+550=9350
(6 - 2 x ) + 4 = - 5 x - 3
- 2 x + 6 + 4 = - 5 x - 3
-2 x + 5 x = -6-4-3
3 x = -13
x = -13/3
x = -4.33333333333
(a-4)²-2a(3a-4)=a²-8a+16-6a²+8=-5a²-8a+24