Пожалуйста, решите примеры, полностью!) Даю 35 БАЛЛОВ!!

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157 (x²-y²)/xy : (x-y)/3y * 1/(x+y) = (x-y)(x+y)/xy * 3y/(x-y) * 1/(x+y) = 3(x+y)/x * 1/(x+y) = ³/ₓ. 158 a/(a²-c²) * (a+c)/2ac : 1/(a-c) = a/(a-c)(a+c) * (a+c)/2ac : 1/(a-c) =  1/2c(a-c) : 1/(a-c) = 1/2c(a-c) * (a-c)/1 = 1/2c. 159 1/x + x/y - (x+y)/xy = y/xy + x²/xy - (x+y)/xy = (y+x²)/xy - (x+y)/xy =  (y+x²-x-y)/xy = (х²-x)/xy = х(х-1)/ху = (х-1)/у. 160 (a-b)/a + a/b - (a²-b²)/ab = (ab-b²)/ab + a²/ab - (a²-b²)/ab = (ab-b²-a²)/ab - (a²-b²)/ab = (ab-b²-a²-a²+b²)/ab = (ab-a²)/ab = a(b-a)/ab =  (b-a)/b.