写出命题:若△ABC≌△A1B1C1,则BC=B1C1,AB=A1B1,∠BAC=∠B1A1C1.的逆命题,判断其真假,并证明.

问题描述:

写出命题:若△ABC≌△A1B1C1,则BC=B1C1,AB=A1B1,∠BAC=∠B1A1C1.的逆命题,判断其真假,并证明.