Question

Answer 1

Bạn cần giúp bài nào?

Answer 2

Bài 3:

a)

\(N=x^2-10x+25\\ =x^2-2.5.x+5^2\\ =\left(x-5\right)^2\\ =\left(55-5\right)^2\\ =50^2=2500\)

b)

\(P=\dfrac{x^4}{4}-x^2y+y^2\\ =\left(\dfrac{x^2}{2}\right)^2-2.\dfrac{x^2}{2}.y+y^2\\ =\left(\dfrac{x^2}{2}-y\right)^2\\ =\left(\dfrac{4^2}{2}-\dfrac{1}{2}\right)^2\\ =\left(8-\dfrac{1}{2}\right)^2\\ =\left(\dfrac{15}{2}\right)^2=\dfrac{225}{4}\)

`HaNa♬D`