下列各式从左到右的变形中,是因式分解的为( ) A.a2+b2=(a+b)2

下列各式从左到右的变形中,是因式分解的为(  )

Aa2+b2=a+b2     Ba22ab+b2=ab2

Cx2+x3=x3+1    Dxy+z+1=xy+xz+x

答案

B【解答】解:Aa2+b2=a+b2错误;

Ba22ab+b2=ab2是因式分解,故此选项正确;

Cx2+x3=x3+1)错误;

Dxy+z+1=xy+xz+x不是因式分解,故此选项错误;

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