因式分a2b2-a2c2=______．
a2b2-a2c2
=a2（b2-c2）
=a2（b+c）（b-c）．
故答案为：a2（b+c）（b-c）．
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08-32捣固车柴油机总报警信号灯亮时有可能是哪些信号报警？
