Răspuns
Explicație pas cu pas:
4
x*y*z = (4/5)*(5/6) = 2/3
_____
x*y*z = (2/3)*(9/4) = 3/2
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5
x(y - z) = xy - xz = (2/1) - (3/5) = 10/5 - 3/5 = 7/5
________
y(x - z) = yx - yz = 7/6 - 3/4 = 14/12 - 9/12 = 5/12
