BÀI 6. (1 ĐIỂM) VẼ ĐỜNG TRÒN TÂM O NGOẠI TIẾP  ABCGỌI E LÀ GIAO ĐIỂM...

Câu 3a) Ta có: A = ( ^{x x − √ x+ 1 1 −} √ ^{x −1 x − 1} ) ^: ( ^{√ x +} √ ^{x −1 √ x} )

x − 1

√ x

= ( ^{( √ (} √ ^{x+ x − 1)( 1)( x −} √ ^{√ x+ x+1 1) ) −}

√ ^{x − 1} ) ^: ( ^{√ x} √ ^{( √ x − x − 1 1) +}

√ ^{x − 1} )

= ( ^{x −} √ ^{x − √ x +1 1 −}

√ ^{x −1} ) ^: ( ^{x −} √ ^{√ x − x+ 1 √ x} )

x

= ^{x −} √ ^{x+ 1− x+ 1}

√ ^{x − 1 :}

√ ^{x − 1}

− √ ^{x +2}

= ⁻ √ ^{x +2}

x = ^{2 −} √ ^x

√ ^{x − 1 =}

√ ^{x − 1 ⋅}

b) A = 3 => ^{2 −} √ ^x

x = 3 => 3x + √ ^x - 2 = 0 => x = 2/3