Question

Giúp giải hộ mình câu này nha

Answer 1

\(-20x+10x^2-5x^2-10x-5x^2-15x=0\)

\(-45x=0\Leftrightarrow x=0\)

Answer 2

\(-10x\left(2-x\right)-5x\left(x+2\right)=5x\left(x+3\right)\\ \Rightarrow5x\left(x+3\right)+5x\left(x+2\right)+10x\left(2-x\right)=0\\ \Rightarrow5x\left(x+3+x+2+4-2x\right)=0\\ \Rightarrow5x.9=0\\ \Rightarrow45x=0\\ \Rightarrow x=0\)

Answer 3

−10x(2−x)−5x(x+2)=5x(x+3)⇒5x(x+3)+5x(x+2)+10x(2−x)=0⇒5x(x+3+x+2+4−2x)=0⇒5x.9=0⇒45x=0⇒x=0