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lananhdao
2 năm trước
câu 1 : Tính tổng : 1-2+3-4...+99-100+101 Câu 2 : Cho biểu thức : A=(-a-b+c)-(-a-b-c) a) Rút gọn A b) tính giá trị của A khi a=1 b=1 c=-2 Câu 3 : Cho x thuộc Z và -159<x< và = 159 a)Tính tổng các số nguyên x b) tính tích các số nguyên x Help me...........
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