X²-xy-4x+4y=(х²-4х)-(ху-4у)=х(х-4)-у(х-4)=(х-4)(х-у)
2,2 = 2 целых 2/10 = 2 целых 1/5
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= 1 3/15 + 2 1/5 + 1 1/5 = 1 3/15 + 2 3/15 + 1 3/15 = 4 9/15 = 4 3/5 = 4,6
Ответ: 4 целых 3/5 = 4,6.
X²+1/x-2 - x²-1/x+1 = 8
(x²+1)(x+1)/(x-2)(x+1) - (x²-1)(x-2)/(x-2)(x+1) = 8
(x²+1)(x+1)(x²-1)(x-2)/(x-2)(x+1) = 8
(x²+1)(x+1)(x²-1)(x-2)=8(x-2)(x+1)
(x
![^{4}](https://tex.z-dn.net/?f=+%5E%7B4%7D+)
-1)(x+1)(x-2)=(8x-16)*(8x+8)
(x
![^{4}](https://tex.z-dn.net/?f=+%5E%7B4%7D+)
-1)(x+1)(x-2)=(64x²-192x-128)