Toán Lớp 7: tìm x , biết rằng : (2x-1)^6=(2x-1)^5
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 7: tìm x , biết rằng : (2x-1)^6=(2x-1)^5
Comments ( 2 )
=>(2x-1)^6-(2x-1)^5=0
=>(2x-1)^5 . (2x-1)-(2x-1)^5=0
=>(2x-1)^5 . [(2x-1)-1]=0
=>(2x-1)^5 . (2x-1-1)=0
=>(2x-1)^5 . (2x-2)=0
=>[((2x-1)^5=0),(2x-2=0):}
=>[(2x-1=0),(2x=2):}
=>[(2x=1),(x=2:2):}
=>[(x=1/2),(x=1):}
Vậy x\in{1/2;1}