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= 5/2 * 4/15 + 1/36* 6/1 = 2/18= 1/9
b) 2 2/5 * 1 7/8 - (1 1/2)^2 + (1/2)^3 * 2 = 12/5 * 15/8 - (3/2)^2 + 1/8 * 2/1 =
= 9/2 - 9/4 + 1/4 = 18/4 - 9/4 + 1/4 = 9/4 + 1/4 = 10/4 = 2 2/4
c) 2 1/7 + 2 1/7 * 2 4/5 - (1 1/2 : 2 1/4) : 1/6 = 15/7+15/7 * 14/5 - (3/2 : 9/4): 1/6= = 15/7 + 15/7 * 14/5 - (3/4 * 4/9) : 1/6 = 15/7 + 15/7 * 14/5 - 1/3 * 6/1 =
= 15/7 + 15/7 * 14/5 - 2/1 = 15/7 + 6 - 2 = 15/7 + 4/1 = 6 1/7
d) 3 3/7 - 2 1/7 * 2 4/5 : 2 = 24/7 - 15/7 * 14/5 : 2/1 = 24/7 - 6/1 * 1/2 = 24/7 - 3/1=
= 24/7 - 21/7 = 3/7