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10*3/20*4/5=30/20*4/5=3/2*4/5=12/10=1i2/10=1i1/5
b)
4i1/5*2i1/7*3i3/6=21/5*15/7*21/6=63/2=31i1/2
b) 21/5 * 15/7 * 21/6 = 315/35 * 7/2 = 63/7 * 7/2 = 63/2 lub jak wolisz 31,5