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2013年新gre考试:gre数学考点之Commutative Law详解

 Commutative Law Like real numbers, the order does not affect the product or sum of algebraic terms. Example: sum:3x+5y=5x+3y,2x2+4y+1=4y+1+2x2,(3x+2)+(y-4)=(y-4)+(3x+2). product:3x*5y=5y*3x,2x2*4y=4y*2x2,x2yz=yx2z=xzyx,(3x+2)*(y-4)=(y-4)*(3x+2)...

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