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b) 2/3 - 4/5 = 10/15 - 12/15 = (-2/15)
c) 1/4 : 0,5 = 1/4 : 1/2 = 1/4 * 2/1 = 2/4 = 1/2
d) 2,4 * 2/3 + 0,4 = 2 i 2/5 * 2/3 + 0,4 = 12/5 * 2/3 + 0,4 = 8/5 + 0,4 = 1 i 3/5 + 0,4 = 1,6 + 0,4 = 2
b) 10/15 - 12/15 = -2/15
c) 1/4 * 10/5 = 1/2
d) 24/10 * 2/3 + 4/10 = 48/30 + 12/30 = 60/30 = 2