1)-10*4/5:(1*10/17)=-54/5:(27/17)=54/5*17/27=6,8
4)-31,5:(-1*2/5)=31*5/10:(-7/5)=31*1/2:(-7/5)=63/2*(-5/7)=22,5
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1)-10*4/5:(1*10/17)=-54/5:(27/17)=54/5*17/27=6,8
4)-31,5:(-1*2/5)=31*5/10:(-7/5)=31*1/2:(-7/5)=63/2*(-5/7)=22,5