gre数学概率知识点_GRE数学重要知识点：AssociativeLaw

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　　Like real numbers, the grouping does not affect the product or sum of 3 or more algebraic terms.

　　Example:

　　Sum:2x2+(4y+1)=(2x2+4y)+1,

　　3x+(2xy+5y+2)=(3x+2xy)+(5y+2)=(3x+2xy+5y)+2.

　　Product:3x*(2y*4xy)=(3x*2y)*4xy=3x*2y*4xy.

　　Remember:

　　Typically, same variable is grouped together in a single term and the product of same variable is expressed as power.

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