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tim x,y thuoc N* biet 1+x+x^2+x^3=2^y
Tim x,y thuoc N*,biet: 1/x+1/y=1/2
Tim x thuoc N biet ( x - 2 )^2016 + /x -3/=1
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Tim x thuoc N biet
( x - 2 ) ^2016 + ( x -3 ) = 1
a,tim x biet |x-2|+|3-2x|=2x+1
b,tim x,y thuoc Z biet xy+2x-y=5
c, tinh A=(1-1/15)(1-1/21)(1-1/28).....(1-1/210)
tim cac so x,y,z thuoc Q biet rang (x+y):(5-z):(y+z):(y+9)=3:1:2:5
a, Tim x biet:/x-2/+/3-2x/=2x+1
b, Tim x,y thuoc Z biet:xy+2x-y=5
c, tim x,y,z, biet :2x=3y;4y=5zva 4x-3y+5z=7
Tim x thuoc N biet
( x - 2 ) ^2016 + ( x -3 ) = 3
1) Tim a, b thuoc Q biet: a-b=2(a+b)=a:b
2) Tim x thuoc Q sao cho: (x-1)(x+3)<0