J)
4+ [(13-1/90)+1/6)]
4+(12/90+1/6)
4+(4/30+1/6)
4+(2/15+1/6)
4+(12/90+15/90)
4+27/90
4+9/30
4+3/10 => 4/1+3/10 => 40/10+3/10 => 43/10=> 4,3
K)
19/6 + 36-3/90
19/6 +33/90
19/6 + 11/30
95/30 + 11/30
106/30 => 53/15
Pe L ti l voi rezolva putin mai tarziu sper ca te am ajutat