\u5c06\u7535\u963b\u5206\u522b\u4e3aR1\u3001R2\u3001R3\u7684\u4e09\u4e2a\u7528\u7535\u5668\u5e76\u8054\u63a5\u5165\u7535\u8def\u4e2d\uff0c\u901a\u8fc7\u5b83\u4eec\u7684\u7535\u6d41\u4e4b\u6bd4\u4e3aI1\uff1aI2\uff1aI3= R3\uff1aR2\uff1aR1\uff0c\u90a3\u4e48

\u5982\u56fe

R=6