[(x²+18x+81)/(25x²+1-10x)] . [(5x²-x)/(x²-81)]
[(x²-4)/(x²+2x-3)] : [(x²-x-2)/(x-1)]
[(4x²-4)/(2x+2)] . [(X+3)/(x+1)]
[(x²-1)/(x²+x-2)] : [(x²+2x+1)/(x²+x+2)]
[(x+1)/(2x²+4x+2)] . [(x+1)²/(x+1)]
[(x³-x)/(3x-6)] : [(5x+5)/(2x-4)]
[(x²-3x)/(x²+2x+1)] . [(x²-1)/(x²-9)]
[x.(x+9)] / [(5x-1)(x-9)]
[x.(x-1)] / [(x+1)(x+3)]
[2x(x-1)] / 15
(x²+x+2)/[(x+2).(x+1)]
2x+3
(x+2)/[(x+3)(x+1)]
1/2