R1\R2串联电路当中:(1);如:U=9V,U1=6V,R1=12Ω,则:R2= Ω.P1= P2=(2);如:U1=3V,U2=2V,I1=0.5A,则:R1= Ω,R2= Ω.P1= P2=(3);如:U=6V,I=0.2A,R1=5Ω,则:U1= V,R2= Ω.P1= P2=(4);如:U=9V,U2=6V,R1=12Ω,则:U1=

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