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1/5 = 1/R1+1/2R1+1/8
8R1/40R1 = (40+20+5R1)/40R1 》》×40R1
8R1 = 40+20+5R1
8R1-5R1 = 40+20
3R1 = 60
R1 = 60/3
R1 = 20