Question

Substituati a,b si c cu numere intregi nenule si determinati care dintre urmatoarele egalitati sint false:a)(a*b)/c=(a/c)*b,b)(a*b)/c=(a*c)/b,c)(a/b)*c=(a*c)/b,d)(a/b)/c=a/(b/c)

Answer 1

fie a=3, b=4,c=5
a) (a*b)/c=(a/c)*b
(3*4)/5=12/5       (3/5)*4=12/5  A
b)(a*b)/c=(a*c)/b
(3*4)/5=12/5      (3*5)/4=15/4   F
c)(a/b)*c=(a*c)/b
(3/4)*5=15/4     (3*5)/4=15/4   A
d)(a/b)/c=a/(b/c)
(3/4)/5=(3/4)*(1/5)=3/20      3/(4/5)=3*(5/4)=15/4   F