simplify `(x+x^2+x^3+x^4+x^5+x^6+x^7)/(x^-3+x^-4+x^-5+x^-6+x^-7+x^-8+x^-9)`

Simplify: 9x^4(2x^3-5x^4)xx5x^6(x^4-3x^2)

Simplify: 9x^(4)(2x^(3)-5x^(4))x5x^(6)(x^(4)-3x^(2))

Simplify: (9x -7)(2x - 5) - (3x - 8)(5x -3)

Simplify: 5x^2+10+6x+4+5x+3x^2+8

Evaluate lim_(x to sqrt(3)) (3x^(8) + x^(7) - 11x^(6) - 2x^(5) 9x^(4) - x^(3) + 35x^(2) + 6x + 30)/(x^(5) - 2x^(4) + 4x^(2) - 9x + 6)

Evaluate lim_(x to sqrt(3)) (3x^(8) + x^(7) - 11x^(6) - 2x^(5) - 9x^(4) - x^(3) + 35x^(2) + 6x + 30)/(x^(5) - 2x^(4) + 4x^(2) - 9x + 6)

Simplify the following : 5x^(4) - 7x^(2) +8x - 1 +3x^(2) - 9x^(2) + 7 - 3x^(4)+11x - 2 +8x^(2)

Simplify : (25\ x\ a^(-4))/(5^(-3)\ x\ 10\ x\ a^(-8)) (ii) (3^(-5)\ x\ 10^(-5)\ x\ 125)/(5^(-7)\ x\ 6^(-5))

Simplify: 4x^(3)-2x^(2)+5x-1+8x+x^(2)-6x^(3)+7-6x+3-3x^(2)-x^(3)