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Ie=Ib+Ic; Ic=Ie+Ib; Ib=Ie+Ie; Ib=Ic-Ic。
IE=IB+IC IB=IE+IC IC=IB+IE IE=βIB+IC
Ib=Ic+Ie Ic=Ib+Ie Ie=Ic+Ib Ib=Ic=Ie
Ie=Ic+Ib Ib=Ic+Ie Ib=Ic-Ie Ib=Ie=Ic
IB=IC+IE IE=IC+IB IC=IB+IE IC=IB×IE
Ie=Ib+Ic; Ic=Ie+Ib; Ib=Ie+Ic; Ib=Ie=Ic。
Ie=Ic-Ib Ie=Ic+Ib Ie=Ic*Ib Ie=Ic/Ib
Ie=Ib+IcIb=βIc Ic=Ib+IeIb=βIc Ie=Ib+IcIc=βIb Ic=Ib+IeIb=βIc
Ic/Ib>β Ic/Ib<β Ic/Ib=β Ic=Ib=0
IC=βIB IC>βIB IC<βIB IC≥βIB