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Tuanluongnq
2 năm trước
bài 1; cho a=-13, b=25 , c=-30 . tính giá trị của biểu thức a, a+a +12-b b, a+b -(c+b) c, 25+a -(b+c)-a bài 2 ; tính tổng đại số sau một cách hợp lí a, 382+531-282-331 b, 7-8+9-10+11-12+....+2009-2010 c, 1-3-5+7-9-11+...+1000-1002-1004
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