Toán Lớp 6: tìm x thuộc N
x-5 ∈ ư( 2x – 7 )
Leave a reply
Register Now
Login
Lost Password
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Toán Lớp 6: tìm x thuộc N
x-5 ∈ ư( 2x – 7 )
Comments ( 1 )
Vì x-5 ∈ ư( 2x – 7 )
⇒2(x-5) ∈ ư( 2x – 7 )
⇒2x-10 ∈ ư( 2x – 7 )
⇒(2x-7)-(2x-10) chia hết cho x-5
⇒x-5 ∈ ư (3)
⇒x-5 ={1;3}
⇒x∈{6,8}