oblicz ułamki 2 3/20+1,27= 0,65:6 1/2= 4,5-3/4x1/3= (1 2/5+0,5):2= 5/8x4,2-1/4= 4/7x(0,2+1/4)=

2 3/20+1,27 = 43/20 + 127/100 = 215/100 + 127/100 = 342/100 = 3.42. 0,65:6 1/2= 13/20 : 13/2 = 13/20 * 2/13 = 1/5 = 0.2 4,5-3/ 4x1 / 3= 9/2 - 3/4 * 1/3 = 9/2 - 1/4 = 18/4 - 1/4 = 17/4 = 4.25 (1 2/5+0,5):2=  (7/5 + 1/2) : 2 = (14/10 + 5/10) : 2 = 19/20 = 0.95 5/8x4,2-1/4= 5/8 * 21/5 - 1/4 = 21/8 - 1/4 = 21/8 - 2/8 = 19/8 = 2.375 4/7x(0,2+1/4)= 4/7 * (1/5 + 1/4) = ( 4/20 + 5/20 ) * 4/7 = 9/20 * 4/7 = 9/35