\(x^2+4y^2+13-6x-8y=0\)
\(x^2-2\times x\times3+3^2-3^2+\left(2y\right)^2-2\times2y\times2+2^2-2^2+13=0\)
\(\left(x-3\right)^2+\left(2y+2\right)^2=0\)
\(\left(x-3\right)^2\ge0\)
\(\left(2y-2\right)^2\ge0\)
\(\Rightarrow\left(x-3\right)^2+\left(2y-2\right)^2=0\)
\(\Leftrightarrow\left(x-3\right)^2=\left(2y-2\right)^2=0\)
\(\Leftrightarrow x-3=2y-2=0\)
\(\Leftrightarrow x=3;y=1\)
Tìm x,y biết
1) x^2-2x+5+y^2-4y
2) x^2+4y^2+13-6x-8y=0
3) x^2+y^2+6x-10y+34=0
Ai nhanh tớ tích cho nha
CMR x2 + 4y2 + z2 - 2x - 6x + 8y + 15 > 0
Tìm x biết: 9x2 + 6x + 4y2 - 8y + 5 = 0
tìm tất cả x,y thỏa mãn x^2+5y^2-4xy+6x-8y+13≤0
a) x²-16x=0
b) 9x²+6x+4y²-8y+5=0
cho x+2y=3. tính a=x^3-x^2+2x+6x^2y+12xy^2+4xy-4y+4y^2+8y^3
tìm x:
a) 3x(2x-7)-(6x+1)(x-15)-2010=0
b) 2x(x-2012)-x+2012=0
c) (x+2y)(x^2-2xy+4y^2)-8y^3+27=0
d)x^3+x^2-2x-8=0
tim gtnn cua x^2+4y^2+6x+8y+1
Bài 1 tìm x
a) 3x(2x-7)-(6x+1)(x-15)-2010=0
b) 2x(x-2012)-x+2012=0
c) (x+2y)(x^2-2xy+4y^2-8y^3+27=0
d) x^3+x^2-2x-8=0
