若|m|=5,|n|=7,则|m+n|= 已知a=-6,b=-3,c=-8,则-a-(-b+c)若|m|=5,|n|=7,则|m+n|=已知a=-6,b=-3,c=-8,则-a-(-b+c)=若|a+2|+|b+c|+|c-4|=0,则|a+b-c|=
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![若|m|=5,|n|=7,则|m+n|= 已知a=-6,b=-3,c=-8,则-a-(-b+c)若|m|=5,|n|=7,则|m+n|=已知a=-6,b=-3,c=-8,则-a-(-b+c)=若|a+2|+|b+c|+|c-4|=0,则|a+b-c|=](/uploads/image/z/10293331-67-1.jpg?t=%E8%8B%A5%7Cm%7C%3D5%2C%7Cn%7C%3D7%2C%E5%88%99%7Cm%2Bn%7C%3D+%E5%B7%B2%E7%9F%A5a%3D-6%2Cb%3D-3%2Cc%3D-8%2C%E5%88%99-a-%EF%BC%88-b%2Bc%EF%BC%89%E8%8B%A5%7Cm%7C%3D5%2C%7Cn%7C%3D7%2C%E5%88%99%7Cm%2Bn%7C%3D%E5%B7%B2%E7%9F%A5a%3D-6%2Cb%3D-3%2Cc%3D-8%2C%E5%88%99-a-%EF%BC%88-b%2Bc%EF%BC%89%3D%E8%8B%A5%7Ca%2B2%7C%2B%7Cb%2Bc%7C%2B%7Cc-4%7C%3D0%2C%E5%88%99%7Ca%2Bb-c%7C%3D)
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