Rút gọn

Giúp mình câu 22,26,28 vs ạ
----- Nội dung dịch tự động từ ảnh -----
12.
13.
A-
15√x-11
x+2√x-3
14.
3√x-2 2√x+3
√√x+3
x-1
1-√
4
X
x-1
4
15.
Am
4
S
2√
-2√√
x-1
3x+9
16.
4
√√x+3 √x-3x-9
√x-1
1 8√√x
3√√x-2
17.
Am
+
18.
3√√x-1 3√√x+1 9x-1
Q=x+2√x-10 √x-2
3√√x+1
x-x-6
√x-3 √x-2
1
√√x+2 √x+1
19.
164
A=
√x-1 √x-2
20.
E=
x√x-1 x√x+1 √x-
1√x+1 √x-1
X-
-√x x+√x
√x-1 √x+1
x√x+1
x-1
√x
21.
A =
√√x +
x-1
√√x-1
X
√√x+1
1
2-x
22.
A =
√x
+
X
1-
23.
A =
√x-4 3
x-2√x 2-√√x
√√√x+2
√x
√x-2
2x+1
1
x-2
24.
A =
+
x√x-1 1-√x
x+√x+1
25
(x+2√x-2 √x-1
25.
A=1:
x√x+1
x-√x+1 √√√x+1
3
3√x-2
26.
A
+
√x+2 2-√x
:
√x+3 2√x
+
√x-2 2√x-x
27. P=
4√x 8
√x-1 2
+
2+√x 4-x x-2√√x √x
1
28.
P
√x-
1
+
-X
√x √x-1+ √x √√x-1