Toán Lớp 7: tính A= `1/10^2+3/{1^2+2^2}+5/{2^2+3^2}+7/{3^2+4^2}+...+19/{9^2 .10^2`` -

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Toán Lớp 7: tính A= `1/10^2+3/{1^2+2^2}+5/{2^2+3^2}+7/{3^2+4^2}+…+19/{9^2 .10^2“