下列变形正确的是( )
A.-(x-y+z)=-x-y+z | B.x+(-y-z) =x-y-z |
C.3x+2y-3z=3(x+z)+2y | D.-a+b+c-d=-(a-b)-(c-d) |
更新时间:2020-12-04 18:12:15
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