2x+1.3y=12x
tìm x biết
2x+1.3y= 12x
giúp mình với
tim x;y thuoc Z
x+1/3=y-z/5=2x+14/9 và x+z =y
a,125- (x + 1) ^ 2 + x ^ 2 - (- 2x + 3)
b,150-(x-y)(x+y)+x^2-y^2
Chung minh bieu thuc khong phu thuoc vao x,y
tìm x,y thuoc z;
a) x^2-2y =5-xy+2x
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
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)
bai 1 cmr
a)n^3+11n chia het cho 6 voi moi n thuoc Z
b)mn(m^2-n^2)chia het cho 3 voi moi m,n thuoc Z
bai 2 tim x,y thuoc Z
a)(x-1)(3-y)=(-7)
help me
tim x thuoc Z biet : 2x+\(\frac{1}{7}=\frac{1}{y}\)
tim cac gia tri x y thoa man
a,(x^2-1)(x^2-16)<0 va x thuoc Z
B,1/x-y/8=1/16 va x y thuoc N