GRE数学重要知识点：Subtracting Monomials

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　　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.