Oblicz wartość liczbową wyrażenia :
a) 3x-4y+½z dla x= -2, y= 3; z= -6
b) a+b-3c/5d a= 7; b= -4; c=3; d= -5
c) -4m²+5m+6 m= -0,5
d) 3ab+7a-4ab-a+ab a= 1 i 1/12 ; b= -4,3
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a)3x-4y+1/2z= 3*(-2)-4*3+1/2* (-6)=-6-12-3=-21
c)-4m2 +5m+6=-4*(-0,5)+5* (-0,5)+6=-4*0,25+5*(-0,5)+6=-1-2,5+6=2,5