-3a-(2b-c)去括号= m-n-(m+n)结果是= 化简2a-[3b-5a-(2a-7b)]得到= 2x与(x-5)的3倍的差是?
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![-3a-(2b-c)去括号= m-n-(m+n)结果是= 化简2a-[3b-5a-(2a-7b)]得到= 2x与(x-5)的3倍的差是?](/uploads/image/z/5199109-61-9.jpg?t=-3a-%282b-c%29%E5%8E%BB%E6%8B%AC%E5%8F%B7%3D+m-n-%EF%BC%88m%2Bn%EF%BC%89%E7%BB%93%E6%9E%9C%E6%98%AF%3D+%E5%8C%96%E7%AE%802a-%5B3b-5a-%EF%BC%882a-7b%EF%BC%89%5D%E5%BE%97%E5%88%B0%3D+2x%E4%B8%8E%EF%BC%88x-5%EF%BC%89%E7%9A%843%E5%80%8D%E7%9A%84%E5%B7%AE%E6%98%AF%3F)
-3a-(2b-c)去括号= m-n-(m+n)结果是= 化简2a-[3b-5a-(2a-7b)]得到= 2x与(x-5)的3倍的差是?
-3a-(2b-c)去括号= m-n-(m+n)结果是= 化简2a-[3b-5a-(2a-7b)]得到= 2x与(x-5)的3倍的差是?
-3a-(2b-c)去括号= m-n-(m+n)结果是= 化简2a-[3b-5a-(2a-7b)]得到= 2x与(x-5)的3倍的差是?
-3a-(2b-c)
=-3a-2b+c
m-n-(m+n)
=m-n-m-n
=-2n
化简2a-[3b-5a-(2a-7b)]
=2a-[3b-5a-2a+7b]
=2a-[10b-7a]
=2a-10b+7a
=9a-10b
2x与(x-5)的3倍的差
=2x-3(x-5)
=2x-3x+15
=-x+15