http://stackoverflow.com/questions/32065160/method-floatmath-sqrt-not-foundhttp://bbs.mob.com/thread-17165-1-1.html回答都说该改成: (float)Math.sqrt(...)
http://stackoverflow.com/questions/32065160/method-floatmath-sqrt-not-found
http://bbs.mob.com/thread-17165-1-1.html
回答都说该改成: