作业帮已知A=x²y-[x²y-2(xyz-x²z/2)]+x²z1若x=|a|/a+|b|/b+|c|/c+2,且a与b互为相反数,求x的值2若-2a²b的y+2次方与3a²b³是同类项,求y的值3负数z的平方得9,求z的值在123的条件下,求A的值
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![已知A=x²y-[x²y-2(xyz-x²z/2)]+x²z1若x=|a|/a+|b|/b+|c|/c+2,且a与b互为相反数,求x的值2若-2a²b的y+2次方与3a²b³是同类项,求y的值3负数z的平方得9,求z的值在123的条件下,求A的值](/uploads/image/z/3912852-12-2.jpg?t=%E5%B7%B2%E7%9F%A5A%3Dx%26%23178%3By-%5Bx%26%23178%3By-2%28xyz-x%26%23178%3Bz%2F2%29%5D%2Bx%26%23178%3Bz1%E8%8B%A5x%3D%7Ca%7C%2Fa%2B%7Cb%7C%2Fb%2B%7Cc%7C%2Fc%2B2%2C%E4%B8%94a%E4%B8%8Eb%E4%BA%92%E4%B8%BA%E7%9B%B8%E5%8F%8D%E6%95%B0%2C%E6%B1%82x%E7%9A%84%E5%80%BC2%E8%8B%A5-2a%26%23178%3Bb%E7%9A%84y%2B2%E6%AC%A1%E6%96%B9%E4%B8%8E3a%26%23178%3Bb%26%23179%3B%E6%98%AF%E5%90%8C%E7%B1%BB%E9%A1%B9%2C%E6%B1%82y%E7%9A%84%E5%80%BC3%E8%B4%9F%E6%95%B0z%E7%9A%84%E5%B9%B3%E6%96%B9%E5%BE%979%2C%E6%B1%82z%E7%9A%84%E5%80%BC%E5%9C%A8123%E7%9A%84%E6%9D%A1%E4%BB%B6%E4%B8%8B%2C%E6%B1%82A%E7%9A%84%E5%80%BC)
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已知A=x²y-[x²y-2(xyz-x²z/2)]+x²z1若x=|a|/a+|b|/b+|c|/c+2,且a与b互为相反数,求x的值2若-2a²b的y+2次方与3a²b³是同类项,求y的值3负数z的平方得9,求z的值在123的条件下,求A的值
已知A=x²y-[x²y-2(xyz-x²z/2)]+x²z
1若x=|a|/a+|b|/b+|c|/c+2,且a与b互为相反数,求x的值
2若-2a²b的y+2次方与3a²b³是同类项,求y的值
3负数z的平方得9,求z的值
在123的条件下,求A的值
已知A=x²y-[x²y-2(xyz-x²z/2)]+x²z1若x=|a|/a+|b|/b+|c|/c+2,且a与b互为相反数,求x的值2若-2a²b的y+2次方与3a²b³是同类项,求y的值3负数z的平方得9,求z的值在123的条件下,求A的值
a和b一正一负
所以|a|/a,|b|/b一个是1,一个是-1
所以x=0+|c|/c+2=1+2=3或-1+2=1
y=1,z=-3
A=x²y-x²y+2xyz-x²z+x²z
=2xyz
=-18或-6