Question

rut gon bieu thuc 

B= (2x+1)²-(2x+1)(2x-1)

Answer 1

=> B= (2x+1)(2x+1-2x+1)

=> B=(2x+1).2 =>B=4x+2

Answer 2

\(\left(2x+1\right)^2-\left(2x+1\right)\left(2x-1\right)\)

\(=4x^2+4x+1-4x^2+1=4x+2=2\left(x+2\right)\)

chúc bn hc tốt ^^

Answer 3

Ta có B=(2x+1)2-(2x+1)(2x-1)

=>B=4x^2+1-4x^2-2x+2x+1

=>B=(4x^2-4x^2)+(-2x+2x)+(1+1)

=>B=2