智 课 网 G R E 备 考 资 料新gre数学重要考点知识16-智课教育旗下智课教育新gre数学重要考点：Subtracting Monomials Subtracting Monomials To subtract a monomial from another of the same variables just subtract the coefficients. Only two like monomials can be subtracted from each other. Example: By subtracting 3x from 4x, we get (4-3)x=x. By subtracting 3xy from 2xy, we get (2-3)xy=-xy. By subtracting bx from ax, we get ax-bx=(a-b)x. Remember: Monomials can be subtracted only if they have the same variables with identical powers.