2013年4月新gre考试备考：gre数学考点Adding Monomials
Adding Monomials To add two monomials of the same variables just add the coefficients. Only two like monomials can be added together. Example: By adding 3x and 4x, we get (3+4)x=7x. By adding 3xy+2xy, we get (3+2)xy=5xy. By adding as and bx, we...