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b) (-13/5) * 25/8 + 1/8 = -13 * 5/8 +1/8 = -65/8 + 1/8 = -64/8 = -8
c) (-20/3) : (-50/7) - 13/15 = (-20/3) * (-7/50) - 13/15 = 140/150 - 130/150 = 1/15
d) -6 * 10/3 + 7/2 * 1/5 = -20 + 7/10 = -19 3/10
e) 3/4 * 10/3 - (-7/6) * 5/6 = 10/4 + 5/6 = 30/12 + 10/12 = 40/12 = 3 1/3
f) 7/4 : (3/4 - 10/4) - 1/2 = 7/4 : (-7/4) - 1/2 = 7/4 * (-4/7) - 1/2 = -1 - 1/2 = -1 1/2