bai nay kho qua hay sao ma chang ai lam the

T

thangatk

ca bai nay nua
cho[tex]a^2+b^2=1[/tex] va c+d=6
tim min cua [tex]c^2+d^2[/tex] -2ac-2bd
 
T

thangatk

cuoi cung thi cung ra , khong ngo lai de the tuc that
chi can xet khoang cach tu 1 diem thuoc duong tron [tex^]a^2+b^2=1[/tex]en c+d=6 la ra
 
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