Tim x,y la so nguyen 

a) 2x-3y+5= xy

b) x mu 2 +2xy+2x+4y

B2 Tim x,y la so nguyen to

x mu 2 -2y mu 2 =1 

B3 Tim so tu nhienx,y 

7 .(x-2004) mu 2 = 23- y mu 2

tim so tu nhien x , biet

a, 5x - x = 29 - 36 : 4

b, ( 3x - 48 ) . 6 = 3 mu 3 . 2 mu 2 + 2 mu 3 . 3 mu 2 - 12 mu 2

c, x thuoc B(6) va 22 < x < hoac = 36

cau 1:tinh gia tri bieu thuc

3/4 +1/1/4 *2/2/3-(-1/2)^2:6/5

cho ma co 2 dau/la hon so,con 1 dau la phan so,con ^2 la mu 2

cau 2:tim x biet

( x-1)^5= -32

cho ^5 co nghia la mu 5

B1) Tinh

a) 245-4 . [15: 8 +2.(4+3 mu 2 -9)]
 

b) 375: 5 mu 3 -( 3 mu 8: 3 mu 6 -2 .2 mu 3)

B2: Tim x

a) 2x -2 mu 3 .3 mu 2=138

b) ( 6x- 3 mu 4) . 7 mu 3= 3 . 7 mu 4

c) 1+2+3+..............+x =500500

co sô mu la mot so nho nhat nhu la x vay va la so như hinh a b c tư ngi1 2 3 4 5 6 7 8 9 khac 0 x phai lon hon 100 ta xep duoc bao nhiêu sô

tim cac gia tri cua x de bieu thuc sau nhan gia tri am

a)x mu 2 + 5x  b)x mu 2 - 5/2x   c)3(2x+3)(3x-5)    d)x - 2/x-6     e) x mu 2 -1/x mu 2

bai 1: 2-3x=-5x+4

{x-1}mu 4={x-1}mu 40

3x-[2x-{5x+1}]=4

Bai 2:Ban Minh di xe dap tu nha den truong voi van toc 12km/h thi het nua gio. Neu ban di voi van toc 10km/h thi phai mat them bao nhieu thoi gian.

Bai 3: Chia so 1000 thanh 3 phan

Ti so giua phan 1 va phan 2 la 2; phan 2 va phan 3 ti le nghich voi 5 va 6.

1. So sánh a/b (b lon hon 0 ) và a+n/b+n (n thuoc N*)
2. Xac dinh so nguyen x de x mu 2 -3/x mu 2 -1 la so nguyen