灰兔拔了50个萝卜，白兔拔了20个萝卜，它俩共拔了多少个萝卜？-_'i*e+\9]4A1b.D;a
算式：提示0v)s5F)^.w)a+E3O:`,C;V-_'i*e+\9]4A1b.D;a
答：它俩共拔了+X+S3j4s4\4T;^*v个萝卜。-_'i*e+\9]4A1b.D;a