SAN FRANCISCO — SoftBank formally started off its course of action for getting a big stake in Uber with a proposal to purchase some shares in a valuation of $forty eight billion, much under the practically $70 billion valuation the ride-ha…

SAN FRANCISCO — SoftBank formally begun its process for purchasing an important stake in Uber with an offer to acquire some shares in a valuation of $forty eight billion, far below the virtually $70 billion valuation that the ride-hailing …