Oblicz Ułamki a) (1 1/12+1 1/6) : (5 3/5-3 29/40)= b) (1 1/3+20/21) : (2 2/3-2 2/7)= c) (4 4/7- 2 9/14) : ( 7 6/7-7 15/28)= d) (3 1/3+ 2 5/7-5 4/7) : 14/15=
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a) (13/12 +7/6) : (28/5 - 149/40) = (13/12 + 14/12) : (224/40 -149/40) = 27/12 : 75/40 = 9/4 : 75/40= 90/40 *40/75= 90/75= 6/5= 1 1/5
b) (1 1/3+20/21) : (2 2/3-2 2/7)= (4/3 + 20/21) : (8/3 - 16/7)= (28/21+20/21) : (56/21 - 48/21)= 48/21: 8/21= 48/21 * 21/8= 6
c) (4 4/7- 2 9/14) : ( 7 6/7-7 15/28)= (32/7 - 37/14) : (56/7 - 211/28)= (64/14 - 37/14) : (224/28 - 211/28)= 27/14 : 13/28= 54/14 : 13/28= 54/28 * 28/13= 4 2/13
d) (3 1/3+ 2 5/7-5 4/7) : 14/15= (10/3 +19/7 - 39/7) : 14/15= (70/21+ 57/21 - 117/21) *15/14= 10/21 *15/14= 25/39