Cho biểu thức A. Rút gọn A. Tính giá trị của biểu thức A biết y = 2 / (2 + √3)

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----- Nội dung dịch tự động từ ảnh -----
B3. A = (√5 - 1 y
a) Rut gon A
b) Tính
giá
: (
√y-1
vy
+
tri aia A biet
1-√y
gty) với yoy11
>0;y+1
y+vy
· y = 2+√5
Ci Tìm giá trị y thỏa mãn Ayory-3-vy-4