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2/5* 1 2/5*(-10)*(-5/14)=
= 2/5 * 7/5(-10) * (-5/14) = 14/25(-10)(-5/14) =
= -14/5 * 2(-5/14) = 2
b)
- 1/27*(-5 2/2)*(-1/4)*(-2) =
= -1/27(-12/2) * 1/2 = 1/27 * 6 * 1/2 = 1/27 * 3 = 1/9
b)