(-x+y)( )=x2-y2,其中括号内的是( )A.-x-yB.-x+yC.x-yD.x+y
题型:单选题难度:简单来源:不详
(-x+y)( )=x2-y2,其中括号内的是( ) |
答案
x2-y2, =(x+y)(x-y), =(-x+y)(-x-y). 故选A. |
举一反三
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