题目内容
下列去括号的各式中①x+(-y+z)=x-y+z;②x-(-y+z)=x-y-z;③x+(-y+z)=x+y+z;④x-(-y+z)=x+y-z正确的是( )
| A.①② | B.②③ | C.③④ | D.①④ |
①x+(-y+z)=x-y+z,故本项正确;
②x-(-y+z)=x+y-z,故本项错误;
③x+(-y+z)=x-y+z,故本项错误;
④x-(-y+z)=x+y-z,故本项正确.
综上可得只有①④正确.
故选D.
②x-(-y+z)=x+y-z,故本项错误;
③x+(-y+z)=x-y+z,故本项错误;
④x-(-y+z)=x+y-z,故本项正确.
综上可得只有①④正确.
故选D.
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