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hoangmayy
2 năm trước
cho a,b,c là 3 số khác 0 thỏa mãn điều kiện ab/(a+b)=bc/(b+c)=ca/(c+a).tính giá trị của biểu thức P=(20ab+4bc+2020ca)/(a^2+b^2+c^2)
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