3) 1-y/y(z-x) + x-1/x(x-y) + y/xy(x-y)= x-y-y*x-y*z/y(x-y)*(z-y)
4) 108/y(y-12)+9/y+12=108/3(3-12)+9/3+12=7/5= 1 2/5 або 1.4
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3) 1-y/y(z-x) + x-1/x(x-y) + y/xy(x-y)= x-y-y*x-y*z/y(x-y)*(z-y)
4) 108/y(y-12)+9/y+12=108/3(3-12)+9/3+12=7/5= 1 2/5 або 1.4