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b)-x(2-x)-(x+8)=-4(2-4)-(4+8)=-4*(-2)-(-4)=8-(-4)=12
c)xy(1-x)-xy(2-x)=31*29(1-31)-31*29(2-31)=31*29*(-30)-31*29*(-29)=-899
d)(x³-2x²+x)(8:x)/4=(-5³-2*(-5)²+(-5))(8:(-5)/4=(-125-2*25+(-5))*(-1,6)/4=(-125-50+(-5))*(1,6)/4=-180*1,6/4=-288/4=-72
b) -4 (2 - 4) - (4 +8) = -4 * (-2) - 12 = 8 - 12 = - 4