#249 под буквами б,в

Question

#249 под буквами б,в

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Answer 1

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Answer 2

=-8/25*(-5/16)*(-4/5)=-2/25
=17/9:(1 9/12-3 2/12)=17/9:(1 9/12-2 14/12)=17/9:(-1 5/12)=17/9*(-12/17)=
=-1 1/3