去括号:①(a-b)-(c-d)= ②(a+b)-(-c+d)= ③-{a-(b-c)}=
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![去括号:①(a-b)-(c-d)= ②(a+b)-(-c+d)= ③-{a-(b-c)}=](/uploads/image/z/613335-39-5.jpg?t=%E5%8E%BB%E6%8B%AC%E5%8F%B7%EF%BC%9A%E2%91%A0%28a-b%29-%28c-d%29%3D+%E2%91%A1%28a%2Bb%29-%28-c%2Bd%29%3D+%E2%91%A2-%7Ba-%28b-c%29%7D%3D)
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