1.Tim cac chu so x va y de so 1x8y2 chia het cho 36

2.tim cac gia tri nguyen cua n de phan so A=3.n+2/n-1 co gia tri la so nguyen

3.tim cac chu so x y thoa man 

(x-2)^2.(x-3)^2=4

4.tim so tu nhien x biet 

(x-5):3/100=20.x/100 +5

tim A=√x+1/√x-1 CMR x=16/9 va x=25/9 thi A co gia tri nguyen

tinh nhanh

K = [ 1-1/4 ] x [ 1-1/9 ] x [ 1-1/16 ] x [ 1-1/25 ] x [ 1-1/36 ]

tim z,y,z thoa

can x cong can  tat ca y tru 1 cong can  tat ca z tru 2 bang 1 phan 2 ( x cong y cong z)

tim GTN cua B bang 1 phan x tru can x cong 1

tim x thuoc z de can x cong 1 phan can 3 tru 3 la so nguyen

tinh tong T bang 1 phan can 1 cong can 2 cong 1 phan can 2 cong can 3 cong ... cong den 1 phan can 99 cong can 100

tim y , x biet

( x - 1) ( 2y + 3 ) = 24

( x- 5 ) ( x + y ) = 12

( x + 1 ) ( x + 2 ) + ... + ( x +100 ) = 5750

Tim so nguyen to p de : p + 1, p + 2, p + 3 , p + 5 cung la so nguyen to

Cac ban giup minh nhe ! Hom nay minh phai di hoc roi

tim cac so nguyen x;y sao cho

a;(x+1)+(x+3)+.....+(x+99)=100

b;(x-3)+(x-2)+(x-1)+....+10+11=11

a)Tim so nguyen x va y biet :

5/x+y/4=1/8

b)Tim so nguyen x de A co gia tri la 1 so nguyen biet :

A=(căn x +1) /(căn x -3) (x lớn hơn hoặc bằng 0)

cho A= \(\frac{1-\sqrt{x}}{1+\sqrt{x}}\)   ,B=\((\frac{15-\sqrt{x}}{x-25}\)+\(\frac{2}{\sqrt{x+5}}\)) : \(\frac{\sqrt{x}+1}{\sqrt{x}-5}\)

a) tinh gia tri bieu thuc A khi x = 16

b) rut gon B

c) tim x để ( B-A) nguyen