`(a^(5) - a^(3)) div (a^(2) + a) = "__________"`

(x^5 div x^4)^3 div x^2 = ?

199 + 5^(3)div 4xx4^(2)=?

Evaluate: (3)/(5) div 2

Simplify : 7x + 4{x^(2) div(5x div 10)} - 3{2 - x^(3) div (3x^(2) div x)}

The value of ((7)/(8) div 5(1)/(4) xx 7(1)/(5) - (3)/(20) " of " (2)/(3)) div (1)/(2) + ((3)/(5) xx 7(1)/(2) + (2)/(3) div (8)/(15)) is equal to 7+k , where k =