Toán Lớp 7: x^2020 = x^2020-2/3 làm giúp mik nha
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: x^2020 = x^2020-2/3 làm giúp mik nha
Comments ( 2 )
x^2020 = x^2020 -2/3
=>x^2020 -(x^2020 -2/3 )=0
=>x^2020 -x^2029 +2/3=0
=>0+2/3=0
=>2/3 =0 ( vô lí )
Vậy x∈∅
*Nếu đề là :
x^2020 =(x^2020 -2)/3
– Áp dụng : a/b=c/d=>ad=cb
=>x^2020 . 3=(x^2020 -2).1
=>x^2020 . 3=x^2020 -2
=>x^2020 – x^2020 . 3=2
=>(1-3) . x^2020 =2
=>-2 . x^2020 =2
=>x^2020 =2:(-2)
=>x^2020 =-1
=>(x^1010)^2 =-1
Mà (x^1010 )^2 >=0 ; -1<0
=>(x^1010 )^2 =-1 ( vô lí )
Vậy x∈∅