Найдите значение выражения: 1) (-4/15 + 5/9) : (-26/45); 3) (-3 3/10 - 1 8/15) : (-1 2/27); 2) -12 : (-2 1/13) + 1 1/4

1) (-4/15 + 5/9) : (-26/45)=(-12+25)/45 * (-45/26)=13/26=1/2; 2) -12 : (-2 1/13) + 1 1/4 : (-15/46)=-12/1 * (-13/27) + 5/4 * (-46/15)=52/9 - 23/6=(104-69)/18=35/18=1 17/18; 3) (-3 3/10 - 1 8/15) : (-1 2/27)=(-4 + (-9-16)/30) * (-27/29)=(-4-5/6) * (-27/29)=-4 5/6 * (-27/29)=-29/6 * (-27/29)=-1/2 * (-9/1)=9/2=4,5;4) (9/20 - 7/8) : (-7/45 - 2/9)= (18-35)/40 : (-7-10)/45=-17/40 * (-45/17)=45/40=9/8=1 1/8.