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a) 2/3*1/4 = 1/6
b) 21/60*3/7=3/20
c) 5/8*6/25=3/20
d) 3/35*10/11=6/77
poziom B
a) 4/21*7/6*9/2=1
b) 2/3*6/7*7/8=1/2
c) 3/20*10/9*4/11=2/33
d) 8/3*15/14*7/12=5/3 = 1 2/3
poziom C
a) 4*2 3/8 = 4*19/8 = 19/2=9,5
b) 3*12 2/7 = 3*86/7 = 258/7 = 36 6/7
c) 5*1 2/7 = 5*9/7 = 45/7=6 3/7
d) 8*2 1/4=8*9/4=18
poziom D
a) 3/14*2 1/3 = 3/14*7/3 = 1/2
b) 3 3/5*2 1/12=18/5*25/12=15/2=7,5
c) 3 1/4*3 1/13 = 13/4*40/13=10
d) 1 5/7*4 2/3 = 12/7*14/3 = 8