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a) 9/10 * 8/3 =12/5
b)2/5 *20/3= 8/3
c) 5/9 * 6/25= 2/15
d) 8/21 *7/6= 2/3
e) 25/9 : 5/3= 25/9*3/5=1cała 2/3
f) 5/3:25/9=5/3*9/25=3/5
g)4:32/5=4*5/32=5/4
h)56/9*1/7=8/9