如图电路,已知R1=R4=1欧,R3=4欧,R2=R5=3欧,求电源两端等效电阻.答案好像是4/3R..class="ikqb_img" src="http://h.hiphotos.baidu.com/zhidao/wh%3D600%2C800/sign=45c241a5738da9774e7a8e2d8061d421/d000baa1cd11728b48420eb4c8fcc3cec3fd2c3c.j
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