Question

mọi người giúp mình với

 

Answer 1

b) \(d\cap Oy=\left(0;3\right)\)
\(d\cap Ox=>y=0=>x=\dfrac{3}{4}=>\left(\dfrac{3}{4};0\right)\)
c) \(d_{\left(0;d\right)}=\dfrac{\left|3\right|}{\sqrt{1^2+4^2}}=\dfrac{3}{\sqrt{17}}\)
d) \(d_{\left(x;d\right)}=\dfrac{\left|4.\left(-1\right)+\left(-2\right).1-3\right|}{\sqrt{4^2+1^2}}=\dfrac{9}{\sqrt{17}}\)
e) \(S_{OAB}=\dfrac{1}{2}.\dfrac{3}{4}.3=\dfrac{9}{8}\)