3.x-|2.x+1|=2
=>-|2.x+1|=2-3.x
TH1:-(2.x+1)=-(2-3.x)
=>2.x+1=2-3.x
=>2.x+3.x=2-1
=>5.x=1
=>x=1/5
TH2:-(2.x+1)=2-3.x
=>-2.x+1=2-3.x
=>-2.x+3.x=2-1
=>x=1
Tim x biet : 20 . 2^x + 1 = 10.4^2 + 1
Tim x : ( 4-x:2)^3 - 1 = 2 . (2^3 - 5 : 2^0 )
tim x(x+2)3-3(x+2)2=2(x-1)(x+2)-((1-x)3
tim x biet 1/2(x-2/3)-1/3(2x-3)=x+1/2
1 )Tim x, y thuoc Z
x + y = x.y
2) Tim x thuoc Z
(x + 1)+(x+3)+(x+5)+...+(x+99)=0(x-3)+(x-2)+(x-1)+...+10+11=11-12(x-5)+7(3-x)=530(x+2)-6(x-5)-24x=1001,tim cac so nguyen x,y biet: -2/x=y/3 va x<0<y
2, Tim cac so nguyen x,y biet:x-3/y-2=3/2 va x-y=4
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 x:(1+x)3-2(x-2)2=(x-2)3-3(3+x)2
A = 2/ x-1 .tim dieu kien cua x de A la phan so . tim A khi x = 2 ; x = -3. tim dieu kien cua x de A la so nguyen ( A thuoc Z )
|3/2.x+1/2|=3/2.Tim x
