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A组题一、判断题 (每小题 2分 ,共 1 0分 )1 .x5-y5=(x2 -y2 ) (x3 +y3 ) ( ) .2 .(x -y) n=(y-x) n(n为偶数 ) ( ) .3 .x6-y6=(x3 -y3 ) (x3 +y3 )=(x -y) (x2 +y2 ) (x3 +y3 ) ( ) .4.(a -b) 2 -(a +b) 2 =2a4( ) .5 .8a3 -6a2 +2a的公因式是 2a ( ) .二、选择题 (
A group of questions, determine the question (each question 2 points, a total of 10 points) 1 .x5-y5 = (x2 -y2) (x3 + y3) () .2 . (x -y) n = (yx) n (n is even) () .3 .x6-y6=(x3 -y3) (x3 +y3)=(x -y) (x2 +y2) (x3 +y3) () .4.(a -b The common factor of 2 -(a +b) 2 =2a4( ) .5 .8a3 -6a2 +2a is 2a( ).