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b) 8z-2(5z+6)+7z-4 =8z-10z-12+7z-4=5z-16=5*¾-16=¹⁵/₄-16= 3¾-16= -12¼
c) 4p-2(8-p²)+5p²-p =4p-16+2p²+5p²-p=7p²+3p-16= 7*(½)²+3*½-16 = 7*¼+1½-16=⁷/₄+1½-16=1¾+1²/₄-16=3¼-16=-12¾
d) (x+y)-(x-y)=x+y-x+y=2y=2*(-0,5)=-1