Question

1.Sa se calculeze valoarea expresiei E egal x+y+z+t , unde a) x egal 9-7-10+3; y egal -3+(-9)+(-10)+14; z egal -2+(-5)-3+(-9); t egal -18+(-5)-(-6)+8; b) x egal -104+(-201)+350; y egal 250-(-100)-300; z egal 500-650-(-150); t egal -820-(-32)+43+(-13)

2.fie multimea A egal{n apartine Z /-2012 a)cate elemente are multimea A?
b)aflati suma elementelor multimii A

Answer 1

1 a)x=9-7-10+3=> x= -5
y= -3-9-10+14    => y= -8
z= -2 -5-3-9      z= -19
t= -18-5+6+8      t= -9
E=x+y+z+t
E= -5+(-8)+(-19)+(-9)=-41
b) x=-104-201+350 =45
y=250+100-300=50
z=500-650+150=0
t= -820+32+43-13= -758
E= 45+50 -758 = -663