Tìm GTLN nak !!!
\(C=-x^2-2x+5-y^2+4y\)
\(=\left(-x^2-2x-1\right)+\left(-y^2+4y-4\right)+10\)
\(=-\left(x+1\right)^2-\left(y-2\right)^2+10\le10\)có GTLN là 10
Dấu "=" xảy ra \(\Leftrightarrow\hept{\begin{cases}\left(x+1\right)^2=0\\\left(y-2\right)^2=0\end{cases}\Rightarrow\hept{\begin{cases}x=-1\\y=2\end{cases}}}\)
Vậy \(C_{max}=10\) tại \(x=-1;y=2\)
tim GTLN hoac GTNN cua bieu thuc B= -x2-8x+5
tim GTLN hoac GTNN cua bieu thuc C= -x2+6x+1
tim GTLN hoac GTNN cua bieu thuc D= -3x2 +12x+11
tim gtnn hoac gtln cua bieu thuc sau
A=100-(x^2-4)^2-3(x+2)^2
B=4-2x^2+3x
mn giup mk vsss
tim gtln hoac gtnn cua bieu thuc
A=x2-x
lm on giup minh nha
tim GTNN va GTLN cua bieu thuc E= 2x2 +20x-43
Tim gtln hoac gtnn cua bt
A=27-12x/x^2+5
tim GTLN hoac GTNN cua bthuc
a) A=x2-6x+11
B=2x2+10x-1
c) 5x-x2
bai 1:tim GTNN cua bieu thuc
A=x2+3x+7
B=(x-2)(x-5)(x2-7x-10)
bai 2:tim GTLN cua bieu thuc
A=11-10x-x2
B=[x-4](2-[x-4])
bai 3:tim x,y sao cho
A=2x2+9y2-6xy-6x-12y+2016 co GTNN
B=-x2+2xy-4y2+2x+10y-8 co GTLN
bai 4 :
a)cho x+y=3;x2+y2=5.tinh x3+y3
b)cho x-y=5;x2+y2=15.tinh x3-y3
