Question

khai triển các hằng đẳng thức sau

(5x+3yz)^2

(2x-3)^3

Answer 1

\(\left(5x+3yz\right)^2=25x^2+30xyz+9y^2z^2\\ \left(2x-3\right)^3=8x^3-36x^2+54x-27\)

Answer 2

\(\left(y^{2x}+3yz\right)^2=y^{4x}+6y^{2x+1}z+9y^2z^2\\ \left(x^2-6z\right)\left(x^2+6z\right)=x^4-36z^2\\ \left(y-5\right)\left(25+2y+y^2+3y\right)=\left(y-5\right)\left(y^2+5y+25\right)=y^3-125\)