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Rezolvati ecuatiile:
a)(z:9)x15-47=28;
b)92+56:(14-y)=100;
c)(410-t):7+70=120.
Va rog!!!


Răspuns :

a) 15z/9 = 28 +47 ;  15z/9 = 75 ; z/9 = 5.  => z = 9x5 = 45
b)56/(14-y) = 100 - 92 ; 56 = 8 x (14 -y) ; 7 = 14 - y ; y = 14-7 = 7
c) (410 - t)/7 = 120-70; (410 - t)/7 = 50 ; 410 - t = 7 x 50. t = 410 -350 = 60