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b) 11/4 * 8/1= 88/4= 22
c) 8/10 * 10/14= 80/ 140= 40/60= 4/6= 2/3
d) 19/8 * 4/19= 4/8 (skracamy 19 czyli skreślamy ) = 2/4= 1/2
e) 24/7 * 3 15/100= 24/7 * 315/100= 7560/700= 756/70= 378/35=10 28/35
f) 2/1 * 9/10 * 13/3= 18/10 * 13/3= 234/30= 117/15= 7 12/15
g) 2/10 * 5/6 * 3/1= 10/60 * 3/1= 30/60= 3/6= 1/3
h) 35/8 * 3/1 * 8/7= 105/8 * 8/7= 105/7 (skracamy 8 ) = 15
i) 4 2/10 * 20/7* 26/9= 42/10 * 20/7 * 26/9= 840/70 * 36/9= 30240/630= 3034/63= 48