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-1 2/3*(-4/7)*(-1 1/20)=
= -5/3(-4/7)(-21/20) = -5/3 * 3/5 = -1
b)
-5/12*(-8)*(-9/25)=
= -5/3 * 2 * 9/25 = -2 * 3/5 = -6/5 = -1 1/5
c)
5/8*(-6)*(- 1 1/15)=
= -5/4 * 3(-16/15) = 3 * 4/3 = 4
d)
- 1 2/3*(-2 2/5)*(-1 1/7) =
= -5/3(-12/5)(-8/7) = 4(-8/7) = -32/7 = -4 4/7