Toán Lớp 8: phan tich dA THUC THANH NHAN tu bang pp them bot hang tu
x^4+4y^4
nahnhhhhhhhhhhhhhhhhhhhhh
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 8: phan tich dA THUC THANH NHAN tu bang pp them bot hang tu
x^4+4y^4
nahnhhhhhhhhhhhhhhhhhhhhh
Comments ( 2 )
=x^4+4x^2y^2+4y^4-4x^2y^2
=[(x^2)^2+2·x^2·2y^2+(2y^2)^2]-(2xy)^2
=(x^2+2y^2)^2-(2xy)^2
=[(x^2+2y^2)+2xy][(x^2+2y^2)-2xy]
=(x^2+2y^2+2xy)(x^2+2y^2-2xy)