Tim x,y biet:

1)x^2-2x+5+y^2-4y=0

2)4x^2+y^2-20x+26-2y=0

3)x^2+4y^2+13-6x-8y=0

4)4x^2+4x-6y+9x^2+2=0

5)x^2+y^2+6x-10y+34=0

6)25x^2-10x+9y^2-12y+5=0

7)x^2+9y^2-10x-12y+29=0

89x^2+12x+4y62+8y+8=0

9)4x^2+9y^2+20x-6y+26=0

10)3x^2+3y^2+6x-12y+15=0

11)x^2+4y^2+4x-4y+5=0

12)4x^2-12x+y^2-4y+13=0

13)x^2+y^2+2x-6y+10=0

14)4x^2+9y^2-4x+6y+2=0

15)y^2+2y+5-12x+9x^2=0

16)x^2+26+6y+9y^2-10x=0

17)10-6x+12y+9x^2+4y^2=0

18)16x^2+5+8x-4y+y^2=0

19)x^2+9y^2+4x+6y+5=0

20)5+9x^2+9y^2+6y-12x=0

21)x^2+20+9y62+8x-12y=0

22)x^2=4y+4y^2+26-10x=0

23)4y^2+34-10x+12y+x^2=0

24)-10x+y^2-8y+x^2+41=0

25)x^2+9y^2-12y+29-10x=0

26)9x^2+4y^2+4y+5-12x=0

27)4y^2-12x+12y+9x^2=13=0

28)4x^2+25-12x-8y+y^2=0

29)x62+17+4y^2+8x+4y=0

30)4y^2+12y+25+8x+x^2=0

31)x^2+20+9y^2+8x-12y=0

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Viết các biểu thức sau dưới dạng tổng của hai bình phương:

5)-12x+13-24y+9x^2+16y^2

6)a^2-4ab+5b^2-4bc+4c^2

7)5x^2+y^2+z^2+4xy-2xz

8)9x^2+25-12xy+2y^2-10y

9)13x^2+4x-12xy+4y^2+1

10)x^2+4y^2+4x-4y+5

11)4x^2-12x+y^2-4y+13

12)x^2+y^2+2y-6x+10

13)4x^2+9y^2-4x+6y+2

14)y^2+2y+5-12x+9x^2

15)x^2+26+6y+9y^2-10x

16)10-6x+12y+9x^2+4y^2

17)16x^2+5+8x-4y+y^2

18)x^2+9y^2+6x-12y

19)5+9x^2+9y^2+6y-12

20)x^2+20+9y^2+8x-12y

21)x^2+4y+4y^2+26-10x

22)4y^2+34-10x+12y+x^2

23)-10x+y^2-8y+x^2+41

24)x^2+9y^2-12y+29-10x5

25)9x^2+4y^2+4y-12x+5

26)4y^2-12x+12y+9x^2+13

27)4x^2+25-12x-8y+y^2

28)x^2+17+4y^2+8x+4y

29)4y^2+12y=25+8x+x^2

30)x^2+20+9y^2+8x-12y

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