Question: Plot---AspectRatio-defaut ratio sometime is not satisfactory

question1:

plot(2/(3*x)+x, x = -5 .. 5)

 

Though this is ok :plot(2/(3*x)+x, x = -5 .. 5, y = -5 .. 5)

but ... lazy to set range of y axis at the very start.

 

 question2:

how to plot more graph on different invertals  one time.

for example the intarvals [-5,5],[-1,1],[0,1]

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