1.总在Rt△ABC,∠C = Rt∠,AB=c,BC=a,AC=b (1).已知a:c = 1:2 ,求a:b (2).已知a:b = 根号2:根号31.总在Rt△ABC,∠C = Rt∠,AB=c,BC=a,AC=b(1).已知a:c = 1:2 ,求a:b(2).已知a:b = 根号2:根号3,c =2根号5,求b
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