Tim nghien cua da thuc

a)A(x)=-4x-5                  h)K(x)=/3x-2/+/4-6x/

b)B(x)=3(2x-1)-2(x + 1)  i)M(x)=/x-1/+(x²-1)²

c)C(x)=(2x²-8)(-x²+1)      j)N(x)=4x²-3x+7

d)D(x)=3x-x³                       k)Pk(x)=7x²-2x-9

l)Q(x)=5x²-11x+6

e)E(x)=2x³+4x

f)G(x)=x³-x²+x-1

Tim x,y sao cho

A=\(2x^2+9y^2-6xy-6x-12y+2004\)co GTNN

B=\(-x^2+2xy-4y^2+2x+10y-8\)co GTLN

tim x;y sao cho

\(A=2x^2+9y^2-6xy-6x-12y+2004\)co GTNN

\(B=-x^2+2xy-4y^2+2x+10y-8\)co GTLN

Bai 1: Tim so nguyen x biet:

x+(x+1)+(x+2)+...+35=0

Bai 2: Tim GTLN:

a) 8-(x+2)^2=E

b) -|x+2|+10=F

Bai 3: Tim x \(\in\)Z:

a)(2x-4)(x+4)<0

b)(x+5)(3x-12)>0

Bai 11: Cho:

S=1-2+3-4+5-6+...+19-20

a) S co\(⋮\)2; 3; 5 khong?

b) Tim tat ca cac uoc cua S

chi tiet gi minh nha

cho bieu thucA=\(\frac{8-x}{x-3}\) 

tim gia tri cua x de A co gia tri bang gia tri bieu thuc M=x+1

tim gia tri nho nhat cua bieu thuc A = x2 -2xy + 4y2 -2x -10y +3

bai 1:Tim x,y,z \(\varepsilon\)Z ,sao cho :|x-y|+|y-z|+|z-x|+|z-t|+|t-x|=2003

bai 2:Cho bieu thuc:E=\(\frac{5-x}{x-2}\)tim gia tri nguyen cua x de

a) E co gia tri nguyen

b)E co gia tri nho nhat

giai dum minh bai nay voi :c=x/2x-2+x^2+1/2-2x^2

a)tim x de a co nghia

b)rut gon bieu thuc c

c)tim gia tri cua x de bieu thuc kia =1/2 

giúp mình cảm ơn nhìu nha !