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8. b) stiind ca a x b = 33/121 si
a x c = 3/11, calculati (b+c) x a si (b - c) x a.

c) stiind ca a x b = 1 intreg 7/8 , a x c = 1/20 si a x d = 7/12, calculați: a x ( b + c - d), a x (b - c + d) si a x (b + c + d)