GRE数学考点：Adding Monomials

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　　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 get ax+bx=(a+b)x.

　　Remember:

　　Monomials can be added only if they have the same variables with identical
powers.