题目内容
下列各式中去括号正确的是( )
A.a2-(2a-b2+b)=a2-2a-b2+b |
B.-(2x+y)-(-x2+y2)=-2x+y+x2-y2 |
C.2x2-3(x-5)=2x2-3x+5 |
D.-a3-[-4a2+(1-3a)]=-a3+4a2-1+3a |
A、a2-(2a-b2+b)=a2-2a+b2-b,故本选项错误;
B、-(2x+y)-(-x2+y2)=-2x-y+x2-y2,故本选项错误;
C、2x2-3(x-5)=2x2-3x+15,故本选项错误;
D、-a3-[-4a2+(1-3a)]=-a3-[-4a2+1-3a]=-a3+4a2-1+3a,故本选项正确.
故选D.
B、-(2x+y)-(-x2+y2)=-2x-y+x2-y2,故本选项错误;
C、2x2-3(x-5)=2x2-3x+15,故本选项错误;
D、-a3-[-4a2+(1-3a)]=-a3-[-4a2+1-3a]=-a3+4a2-1+3a,故本选项正确.
故选D.
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