①-b+0.6b-2.6b
=-b-2b
=-3b
②2(4x-0.5)
=8x-1
③-x+(2x-2)-(3x+5)
=-x+2x-2-3x-5
=-2x-7
④(5a+4c+7b)+(5c-3b-6a)
=5a+4c+7b+5c-3b-6a
=9c+4b-a
⑤(2x²-½+3x)-4(x-x²+½)
=2x²-½+3x-4x+4x²-2
=6x²-x-5/2
①-b+0.6b-2.6b
=-b-2b
=-3b
②2(4x-0.5)
=8x-1
③-x+(2x-2)-(3x+5)
=-x+2x-2-3x-5
=-2x-7
④(5a+4c+7b)+(5c-3b-6a)
=5a+4c+7b+5c-3b-6a
=9c+4b-a
⑤(2x²-½+3x)-4(x-x²+½)
=2x²-½+3x-4x+4x²-2
=6x²-x-5/2