cac ban oi giup minh voi

1.tim a,b thuoc Z,biet:a.(2b-3)=-6

2.cho x,y thuoc Z thoa man x mu 2 +y mu 2 chia het cho 3.chung to x va y chia het cho 3.

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=100

tim x thuoc z

a) (x²+8).(x²-6).(x²+80)< 0

b)/x/+/-x+3/ =7 với 0<x<3

tim x biet:a.2x^2-1=17/8;b.(2x-0,05)(x+3)>0;c.(7-x)(x+19)>0

CHO E=\(\left(\frac{x^3}{x^3-4x}+\frac{6}{6-3x}+\frac{1}{2+x}\right):\left(x+2+\frac{10-x^2}{x-2}\right)\)

a) Rut gon E

b) Tim x thuoc Z sao cho E thuoc Z

tim x thuoc z biet:

8.(x-7)-6.(x-2)=8.6-50

 

Tim x thuoc Z 

       a ,  (-10)+(-9)+(-8)+........+x=23

       b,   (-1)+2+(-3)+4+(-5)+6+..........+x=60

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

cho A = 1/15 nhan 225/(8+2) + 3/14 nhan 196/(3x+6) (x thuoc Z; x khac -2 )

a) Rut gon A

b) Tim x thuoc Z de A thuoc Z

c) trong cac gia tri nguyen A tim gia tri lon nhat va gia tri nho nhat