Question

решите тождество :(a-b)^2 -2ab+2a^2 -b^2=a(3a-4b)

Answer 1

(a-b)ˇ2-2ab+2aˇ2-bˇ2=aˇ2-2ab+bˇ2-2ab+2aˇ2-bˇ2=
=3aˇ2-4ab=a(3a-4b)