Tim x biet:

A. (x-3/4).(3x+1/2)lon hon hoac bang 0 

B. (2x+1).(4x+3)be hon hoac bang 0

1.     cho 4 stn a lon hon hoac bang b, b lon hon hoac bang c, clon hon hoac bang d.

CM:(a-b)(a-c)(a-d)(b-c)(b-d)(c-d)

2.      CM: co the tim dc 1 stn k sao cho: (1997^k)-1 chia het cho 10^4

3.      tong cac chu so cua 1 so chinh phuong co the bang 1995 dc k?

4.      tong cua 1995 stn khac 0 dung bang 1995. Hoi UCLN cua chung la bao nhieu?

1. Cho a, b, c>0 thỏa mãn a+b +c+ ab+ ac+ bc= 6. 
Chứng minh rằng: (a³)/b + (b³)/c+ (c³)/a lon hon hoac bang 3

cho ham so y= f(x) =6/x

tinh f(1) ; f(1.5) ;f(2) ;f(3) ;f(-2/3)

tim x biet y=3 ; y=-2

tim y biet 1<x>3 ; 1.5 be hon hoac bang x lon hon hoac bang 6

diem nao trong cac diem sau day khong thuoc do thi ham s

A(-1;-6 ) ; B(-0.5 ;-12 ) ;C(-0.5 ; -13 ) ; D(-1/3 ; -3 )

cmr : a^2/b^2 +b^2/c^2+c^2/a^2 luon luon lon hon hoac bang c/b+ b/a+ a/c voi a,b,c lon hon 0

cho a,b,c la ba so duong . CMR:a/b+c + b/a+c + c/a+b lon hon hoac bang 3/2

Bai 2: cho a,b,c>0.CMR

\(\frac{a^3}{bc}+\frac{b^3}{ac}+\frac{c^3}{ab}\)lon hon hoac bang  a+b+c

cho a,b,c lon hon hoac bang 1.Tim gtln cua P = (a+1)(b+1)(c+1)/abc+1

cho f(x)=a(x^2)+bx+c voi a,b,c la cac so huu ti.chung minh f(-2).f(3) be hon hoac bang 0.biet rang 13a+b+2c=0