TL:

a, đúng

b, sai

a)đ

b)s

(=) 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

chiếc bắp cải?

đúng lúc mk cần 

chịuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

bằng 0

Chiều rộng thửa ruộng là :

27,5 - 2,3 = 25,2 ( m )

Chu vi thửa ruộng là :

( 27,5 + 25,2 ) nhân 2 = 105,4 ( m )

bn ơi bn có chép sai đề ko 

diện tích thì mình biết chứ thể tích mình ko biết

ko bt và ko CARE

chịuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuuu

câu d AC và CA

học tốt

D

#Học-tốt