Giải hệ phương trình
----- Nội dung ảnh -----
Bài 1: Giải hệ phương trình:
1) \( x + y = 5 - y \)
\( x^2 = 5 - y \)
2) \( x^2 = 2y - 2 \)
\( x + y = -2 \)
3) \( 2x + y = 5 \)
\( y - 1 = 2x + 1 \)
4) \( 2x^2 + (y - 1)^2 = 3 - y^2 \)
5) \( \sqrt{(x - 2y)(x + y)} = 2 \)
\( x + y = -2 \)
6) \( \sqrt{x + 1} - \sqrt{y} = 1 \)
\( x^2 + y = 2 \)
7) \( \sqrt{x^2 + y^2} = 3y - 2x \)
8) \( \sqrt{2x^2 + (y - 1)^2} = 3 - y^2 \)
9) \( \sqrt{(x - y)(x + y)} + 1 = 2x - y^2 \)
10) \( \sqrt{x^2 + y^2 + 2} \)
\( x + y = 2 \)
11) \( 3(1 - y) = 2y \)
12) \( \frac{x + 2}{x + y} = 2 \)
13) \( y - 1 = 2x + 1 \)
\( y - 1 = -2 \)
14) \( \sqrt{x - 3x^2} = 2 \)
15) \( \sqrt{x^2 - y^2} = 2 \)
16) \( \frac{x^2 + xy - 4x}{y^2} = -6 \)
17) \( \sqrt{4y + 3\sqrt{y}} = 2 \)
18) \( x^2 + y^2 - 1 = 4 \)
19) \( \frac{(x + y)(x + 2)}{y^2 - 3x} = 2 \)
20) \( 1 = \sqrt{(x + y)(y - 2)} \)