P P P P P= = − =  =  = − =1 0360 360 360 273 872 1 2 1T K T C− ....

1 .

p p p p p

= = − =  =  = − =

1 0

360 360 360 273 87

2 1 2 1

T K t C

− . => Chọn 12 C.

1 1

1

T T T T