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R1+R2=10 R並=R1R2/(R1+R2)=R1R2/10 用數學的君子不等式: R1R2 =1/4*(2√R1R2)^2 ≤1/4 *(R1+R2)^2 =1/4 * 100 =25 R並≤25/10=2.5 最大電阻:2.5歐
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