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1.在三角形ABC中.设∠B=60°,∠B的对边长b是整数,另两边长a,c是素数,证明△ABC是正三角形.
1. In the triangle ABC, set ∠B=60°, the length b of the opposite side of ∠B is an integer, and the other two sides are a and c is a prime number, which proves that ΔABC is a regular triangle.