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a)F=G*Mm/r² /*r²
r² F=G*Mm /:G*M
(r² F)/(G*M)=m
2.
a)t= x/a -5x /*a
at= x -5xa
at=x(1-5a) /:(1-5a)
(at)/(1-5a)=x
b)p=a+x+ax
p-a=x+ax
p-a=x(1+a) /:(1+a)
(p-a)/(1+a)=x
c)m=(x+1)p-3x
m-(x+1)p=-3x /:-3
(m-(x+1)p)/(-3)=x
d)w= 1/x +p /*x
xw= 1+xp
xw-xp=1
x(w-p)=1 /:(w-p)
x=1/(w-p)