Question

giúp mik vs:(

Answer 1

Thay x=28 vào D ta có:

\(D=\left(x^2-1\right)\left(x^2-2\right)...\left(x^2-2022\right)\\ \Rightarrow D=D=\left(x^2-1\right)\left(x^2-2\right)...\left(x^2-784\right)...\left(x^2-2022\right)\\ \Rightarrow D=\left(x^2-1\right)\left(x^2-2\right)...\left(28^2-784\right)...\left(x^2-2022\right)\\ \Rightarrow D=\left(x^2-1\right)\left(x^2-2\right)...\left(784-784\right)...\left(x^2-2022\right)\\ \Rightarrow D=\left(x^2-1\right)\left(x^2-2\right)...0...\left(x^2-2022\right)\\ \Rightarrow D=0\)