упростите выражения
1) (x+3/x)-(x/x-3)+(9/x²-3x)
2) (b+c/b²-bc)-(4b/b²-c²)-(b-c/b²+bc)
3) (1/x-2)-(6x/x³-8)+(x-2/x²+2x+4)
1) (x+3/x)-(x/x-3)+(9/x²-3x)
2) (b+c/b²-bc)-(4b/b²-c²)-(b-c/b²+bc)
3) (1/x-2)-(6x/x³-8)+(x-2/x²+2x+4)
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