vận tốc xe hai là 45x\(\dfrac{4}{5}\)=36(km/h)

a,so le trong
b,đồng vị

She teaches at a primary school

2(\(\dfrac{3}{4}\)-5x)=\(\dfrac{4}{5}\)-3x
_{^{\(\dfrac{2}{3}\)-10x=\(\dfrac{4}{5}\)-3x
10x-3x=\(\dfrac{3}{2}\)-\(\dfrac{4}{5}\)
7x=\(\dfrac{7}{10}\)
=>x=\(\dfrac{1}{10}\)}}

a)3x3+10x2−8x=0a)3x3+10x2-8x=0

⇔x(3x2+10x−8)=0⇔x(3x2+10x-8)=0

⇔x(3x2+12x−2x−8)=0⇔x(3x2+12x-2x-8)=0

⇔x(x+4)(3x−2)=0⇔x(x+4)(3x-2)=0

⇔⎡⎢ ⎢⎣x=0x=−4x=23⇔[x=0x=-4x=23

Vậy S={0;−4;23}