[填空题]
Suppose that a binary-star system consistskec)u5r , yu/g of two sz*fb l5)wps )y z/uzu6tars of equal mass. They are observed to be separated by 360yz)f/zupwu z)* 5 b6sl million km and take 5.7 Earth years to orbit about a point midway between them. What is the mass of each? $\times 10^{29}$
