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tuanquang080207
2 năm trước
Bài 20: bỏ dấu ngoặc rồi thu gọn biểu thức: a, A = ( a + b ) - ( a - b ) + ( a - c ) - ( a + c ) b, B = ( a + b - c ) + ( a - b +c ) - ( b + c - a ) - ( a - b - c ) Bài 22: Tính tổng tất cả số nguyên x thỏa mãn: |x| < 2013
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