tim x,y thuoc Z sao cho x^2+y^2=2020
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tim x,y,z thuoc N sao cho 1/x+1/y+1/z=1/2
tim x,y thuoc z sao cho (x^2-2) chia het cho (xy+2)
tim x, y, z thuoc Z sao cho /x-y/+/y-z/+/x-z/=2019
tim x, y thuoc Z
sao cho x^6-x^4+2x^3+2x^2=y^2
\(x^6-x^4+2x^3+2x^2=y^2\)
\(y^2+y=x^4+x^3+x^2+x=0\left(1\right)\)
\(\Leftrightarrow y\left(y+1\right)=x\left(x^3+x^2+x+1\right)=0\)
Ta có 4 PT
\(x1=0;y1=0\)
\(x2=0;y2=-1\)
\(x3=-1;y3=0\)
\(x4=-1;y4=-1\)
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tim x thuoc z sao cho \(x^2+102=y^2\)
tim x, y, z thuoc Z sao cho /x-y/+/y-z/+/z-x/=2019
1. tim cac cap so nguyen duong (x, y) sao cho:
2 x3 + xy = 11
2. tim cac cap so nguyen duong (x, y, z)sao cho:
x + y + z = x*y*z
3. tim x thuoc z, biet;
|x| = -2003
|x| = |-2003|
minh dang can gap lam. chieu mai phai nop rui
tim x;y thuoc z sao cho x+y₫ê; x-y₫
3) Tim n thuoc Z sao cho :
a)3n+1chia het cho (n-2)
b)4n-3 chia het cho (2n+3)
4)tim x,y thuoc Z sao cho :
a)xy-3x-y-6=7
b)2xy+10y + x =5
ai nhanh minh tick cho