如图所示,电源电压为1.2V,电阻R1=4Ω,当开关都断开时,电流表的示数为1A;当开关都闭合时,电流表的示数为2A,求R1和R2的阻值.
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![如图所示,电源电压为1.2V,电阻R1=4Ω,当开关都断开时,电流表的示数为1A;当开关都闭合时,电流表的示数为2A,求R1和R2的阻值.](/uploads/image/z/4022185-49-5.jpg?t=%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E7%94%B5%E6%BA%90%E7%94%B5%E5%8E%8B%E4%B8%BA1.2V%2C%E7%94%B5%E9%98%BBR1%3D4%CE%A9%2C%E5%BD%93%E5%BC%80%E5%85%B3%E9%83%BD%E6%96%AD%E5%BC%80%E6%97%B6%2C%E7%94%B5%E6%B5%81%E8%A1%A8%E7%9A%84%E7%A4%BA%E6%95%B0%E4%B8%BA1A%EF%BC%9B%E5%BD%93%E5%BC%80%E5%85%B3%E9%83%BD%E9%97%AD%E5%90%88%E6%97%B6%2C%E7%94%B5%E6%B5%81%E8%A1%A8%E7%9A%84%E7%A4%BA%E6%95%B0%E4%B8%BA2A%2C%E6%B1%82R1%E5%92%8CR2%E7%9A%84%E9%98%BB%E5%80%BC.)
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