设实数a,b在数轴上对应的位置如图所示,化简+的结果是( ) A.-2a+b   

设实数a,b在数轴上对应的位置如图所示,化简+的结果是(  )

A.-2a+b         B.2a+b

C.-b                D.b

答案

D.根据数轴上a,b的位置得出a,b的符号,a<0,b>0,a+b>0,

+=-a+a+b=b.

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