Explicație pas cu pas:
[(1/2+2/3+5/6):7/12-2/5×5/6]×1/4:(5×12/25-1×1/3)-aducem la același numitor in prima paranteza
=[(3/6+4/6+5/6):7/12-10/30]×1/4
=(12/6:7/12-10/30)×1/4
=(7/6-10/30)×1/4-aducem la acelasi numitor
=(35/39-10/30)×1/4
=25/30×1/4
=25/120
