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huytran619
2 năm trước
3.So sánh P với Q biết: P = a { (a - 3) - [ (a + 3) - (-a - 2)] } Q = [ a + (a + 3) ] - [ (a + 2) - (a - 2)] 4.Chứng minh rằng a - (b - c) = (a - b) + c = (a + c) - b Lm đầy đủ=5*+cảm ơn+trl hay nhất
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