Question

4) giup huy khoi phuc lai nhung hang dang thuc bi muc lam nhoe di vai so cho :

a) x²+6xy+....=(.....+3x)² b) (......-......)²=a²-......+4b⁴

c) (....+.....)²=.....+m+1phan 4 d) ....-4n⁴=(m+......)(m-....)

Answer 1

https://hoc24.vn/hoi-dap/question/430400.html

Answer 2

a) \(x^2+6xy+9x^2=\left(x+3x\right)^2\)

b) \(\left(a-2b^2\right)^2=a^2-4ab^2+4b^4\)

c) \(\left(m+1\right)^2=m^2+2m+1\)

d) \(m^2-4n^4=\left(m+2n^2\right)\left(m-2n^2\right)\)

Answer 3

a) x² + 6xy + 9y² = ( x + 3y )²

b) ( a - 2b² ) = a² - 4ab² + 4b⁴

c) ( m + \(\dfrac{1}{2}\))² = m² + m + \(\dfrac{1}{4}\)

d) m² - 4n⁴ = ( m + 2n² ) . ( m - 2n² )

Answer 4

a)\(x^2+6xy+9y^2=\left(x+3y\right)^2\)(đằng sau phải là 3y mới đúng nhé)

b)\(\left(a-2b^2\right)^2=a^2-4ab^2+4b^4\)

c)\(\left(m+\dfrac{1}{2}\right)^2=m^2+m+\dfrac{1}{4}\)

d)\(m^2-4n^4=\left(m+2n^2\right)\left(m-2n^2\right)\)