^ la gi , roi minh se TL

x thuộc {-3; 3; -2; 2; -1; 1}

y thuộc {-5; 5; -4; 4; -3; 3}

2xy-y+4x=14

y(2x+1)+4x+2=16

y(2x+1)+2(2x+1)=16

(y+2)(2x+1)=16=1.16=16.1=2.8=8.2=4.4

Đến đây bạn tự lập bảng, còn lại dễ mà:))

cảm ơn bạn nhiều

?_? i can't help you

sorry but Merry Christmas

theo mk là Tây

trên kinh tuyến hướng Bắc nhá cậu (gọi là cực Bắc)

Merry Christmas

a + 1 là bội của a - 1

=> a + 1 chia hết cho a - 1

=> [(a - 1) + 2] chia hết cho a - 1

=> 2 chia hết cho a - 1, a - 1 thuộc ước của 2 = {1; 2}

a - 1 = 1

=> a = 2

a - 1 = 2

=> a = 3

Vậy a thuộc {2; 3}

(=) 5^2x-3 -2 =3 

(=) 5^2x-3 = 5

(=)2x-3=1

(=)2x=4

(=)x=2

#Học-tốt

a)trên tia Ox có ON <OM (7cm<15cm)

nên điểm n nằm giữa O,M (1)

b)từ (1) suy ra :

         ON+NM=OM ( ON=7cm,Om=15cm)

hay 7+MN=15

          MN=15-7

         MN=8cm 

c)trên tia Ox có MI < MN (1cm<8cm)

nên I nằm giữa 2 điểm M,N (2)

nên: NI+IN=NM

hay NI+1=8

          NI=8-1

         NI=7cm

mà ON=7cm

suy ra ON=NI(=7cm)  (3)

từ (1) (2) cho ta :
N nằm giữa 2 điểm O,I (4)

từ (3) (4) ta đc

N là trung điểm của OI

chịuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

bằng 0

ko bt và ko CARE

chịuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu