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a) Obw=y+2x+5+2x+y+2x=2y+6x+5 -> x=2 y=3
2*3+6*2+5=6+12+5=23
b) Obw=x+x+x+1+2x+3x+y+3x+y=11x+1+2y -> x=2 y=3
11*2+1+2*3=22+1+6=29
c) x+x+1+2x+y+2y+x=5x+1+3y
5*2+1+3*3=10+1+9=20
9.
c)9y-(7y+x)+(6x-7y)=9y-7y-x+6x-7y=-5y+5x x=-2 y=3
-5*3+5*(-2)=-15-10=-25
d) (6a-8b-0,7)-(6,9+a-5b)+1,8=6a-8b-0,7-6,9-a+5b=6a-3b-7,6 a=0,2 b=0,1
6*0,2-3*0,1-7,6=1,2-0,3-7,6=-6,7