14x-14y 14(x-y) 7 3
1)⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻ = ⁻⁻⁻⁻⁻⁻⁻⁻⁻⁻ = --- = 1 --
8x-8y 8(x-y) 4 4
x²+2x x(x+2) x+2
2)----------- = ---------- = ---------
5x 5x 5
17x⁸-17y¹² 17(x⁸-y¹²) 17(x⁸-y¹²) 17 7
3)----------------- = -------------- = --------------- = - ------ = - 1 ------
10y¹²-10x⁸ 10(y¹²-x⁸) -10(y¹²-x⁸) 10 10
6x-6y 6(x-y) 6(x-y) 6 1
4)------------------ = ------------- = - --------------- = - ------- = - ------
18zy - 18zx 18z(y-x) 18z(y-x) 18z 3z