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3 calculati in coditile de mai jos ;
a) 5(u+v) stiind ca u+v=-100;
b) u(y+w), stiind ca uv=uw=-15;
c) (u+v)(w-t), stiind ca uw = ut=vw=v·t=-5


Răspuns :

A. 5(u+v), u+v= -100.
5*(-100)= -500.
B. u(v+w), uv= uw= -15.
uv+uw= -15+(-15)= -30.
C. (u+v)(w-t), uw= ut= vw= v*t= -5.
(uw-wt)+(vw-vt)= (-5-5)+(-5-5)= -20.