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b)...=5/12 *1/5=1/12
c)...=1/3:13/9=1/3*9/13=3/13
d)...=13:13/6*3/4=13*6/13*3/4=6*3/4=9/2=4 1/2
e)...=1/3*3/2*3/2=1/2*3/2=3/4
f)...=2/7* 7 *3=6
b) 1/2 * 5/6 : 5 = 5/12 : 5 = 5/12 * 1/5 = 1/12
c) 1/3 : 1 4/9 = 1/3 : 13/9 = 1/3 * 9/13 = 3/13
d) 13 : 2 1/6 * 3/4 = 13 : 13/6 * 3/4 = 13 * 6/13 * 3/4 = 6 * 3/4 = 9/2 = 4 1/2 = 4,5
e) 1/3 * 1 1/2 : 22/37 : 1/7 : 3 = 1/3 * 3/2 * 37/22 : 1/7 * 1/3 = 1/2 * 37/22 : 1/21 = 37/44 * 21 = 777 / 44 = 17 27/44