Question

a) 5x(x-y)+2(x-2y)²

b)(x-5y)²-(x+3y)²

c)x²-64

d)y^2-100

e)y²-100

Mọi ng chỉ e vs!!!!

Answer 1

b)\(\left(x-5y\right)^2-\left(x+3y\right)^2=\left(x-5y-x-3y\right)\left(x-5y+x+3y\right)\\ =-8y\left(2x-2y\right)=-16\left(x-y\right)\)

c) \(x^2-64=x^2-8^2=\left(x-8\right)\left(x+8\right)\)

d)\(y^{2-100}=y^2:y^{100}=\dfrac{y^2.1}{y^{100}}=\dfrac{1}{y^{98}}\)

e)\(y^2-100=y^2-10^2=\left(y-10\right)\left(y+10\right)\)