The way you have written the expressions, only the numbers 2 and 4 appear in denominators. Their least common multiple is 4. Then your terms become .. 1/4, (18/4)x (10/4)(x +1)
If you intend your expressions to be .. 1/4, 9/(2x), 5/(2(x+1)) then the least common multiple of the denominators is 4*x*(x+1), and your expressions can be written as .. x(x+1)/(4x(x+1)) .. 18(x+1)/(4x(x+1)) .. 10x/(4(x(x+1))
_____ If you write a fraction using plain text, parentheses are required around any numerator containing a sum and around any denominator containing any arithmetic operation. It's all about order of operations. The division symbol only applies to the immediately preceding and the immediately following operand: .. a+b/cd = a+(b/c)*d If you want something else, use parentheses. .. (a+b)/(cd) . . . . for example
