Toán Lớp 6: tìm x : ( x – 1 ) mũ 2 . 49 = 7 mũ 4
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 : ( x – 1 ) mũ 2 . 49 = 7 mũ 4
Comments ( 2 )
=>(x-1)^2 . 7^2=7^4
=>(x-1)^2=7^4:7^2
=>(x-1)^2=7^2
=>(x-1)^2=(+-7)^2
=>[(x-1=7),(x-1=-7):}
=>[(x=7+1),(x=-7+1):}
=>[(x=8),(x=-6):}
Vậy x\in{-6;8}