Toán Lớp 10: a^2+b^2+c^2\geq2(ab+bc-ca) ∀a,b,c ∈RR
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 10: a^2+b^2+c^2\geq2(ab+bc-ca) ∀a,b,c ∈RR
Comments ( 2 )
⇔ a^2+b^2+c^2 -2ab-2bc+2ca ≥0⇔ (a-b+c)^2 ≥0( luôn đúng )vậy giả sử ban đầu là đúng .