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10√28-7√63=x la 2....


Răspuns :

[tex]10 \sqrt{28} - 7 \sqrt{63} = {x}^{2} [/tex]

[tex]20 \sqrt{7} - 21 \sqrt{7} = {x}^{2} [/tex]

[tex] - \sqrt{7} = {x}^{2} [/tex]

[tex]x = \sqrt[4]{7} \: \: sau \: - \sqrt[4]{7} [/tex]