题目内容
下列式子中,正确的是( )
A.x-(y-z)=x-y-z | B.-(x-y+z)=x-y-z |
C.x-2(y+z)=x-2y-z | D.-3(x-y+1)=-3x+3y-3 |
A、x-(y-z)=x-y+z,故此选项错误;
B、-(x-y+z)=-x+y-z,故此选项错误;
C、x-2(y+z)=x-2y-2z,故此选项错误;
D、-3(x-y+1)=-3x+3y-3,故此选项正确.
故选:D.
B、-(x-y+z)=-x+y-z,故此选项错误;
C、x-2(y+z)=x-2y-2z,故此选项错误;
D、-3(x-y+1)=-3x+3y-3,故此选项正确.
故选:D.
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