1+1

a=2;
b=a+3;
c=a+b

{ja,{ty,on},{vera,jitka}}[[2,1]]

opice12
12opice

5 6

kyncl je vul

b c a

a*b*c

(6/3)

(6/2)

(Sqrt[5])

(25^(1/4))

(Sqrt[5.])

1.*120!

N[Pi]

N[Pi,100]

N[Pi]
N@Pi
Pi//N

Solve[(x^3)+4x==17]//N

Solve[{ x+2y==-t,- x+y==(t^2)},{x,y}]

FullForm[x+2y]

TreeForm[x+2y]

x+2y=-t

1==2

x==y//FullForm

Solve[{ x+2y==-t,- x+y==(t^2)},{x,y}]
Solve[ x+2y==-t&&- x+y==(t^2),{x,y}]

?&&

x=2

ClearAll[x]
pom=Integrate[(E^((-3(x^2))/2)),x]

Plot[Evaluate[Integrate[(E^((-3(x^2))/2)),x]],{x,-4,4}]

Plot[Integrate[(E^((-3(x^2))/2)),x],{x,-4,4}]

Plot[pom,{x,-4,4}]

vysl=DSolve[{y''[t]+2y'[t]+y[t]==(E^(-t))*Cos[5t],y[0]==2,y'[0]==-1},y[t],t]

vysl

Plot[vysl,{t,-5,5}]

{opice,kocka}/.{kocka->pes}

a/.a->5

y[t]/.vysl[[1]]

Plot[y[t]/.vysl[[1]],{t,0,5},PlotStyle->{Red,Thick},AxesLabel->{"Osa x","Osa y"}]

Options[Plot]

Plot[{Sin[x],Cos[x]},{x,((-Pi)/2),(Pi/2)},PlotStyle->{{Red,Thick},{Green,Dashed}},AxesLabel->{"x","Sin[x],Cos[x]"}]