x2+5x+6=( )( ),x2+5x-6=( )( ).
x2+5x+6=(x+3)(x+2),
x2+5x-6=(x+6)(x-1).
故答案为:x+3,x+2,x+6,x-1.
阅读对话,并将答案填写在下面横线上。
Wu Yifan: How are you, Mike? You look so happy.
Mike: Yes, I am excited. Our class won the football match.
Wu Yifan: Great! But I am sad today.
Mike: What's the matter?
Wu Yifan: My mom has the flu.
Mike: I'm sorry to hear that.
1. How does Mike feel?
2. How does Wu Yifan feel?
3. Why does Wu Yifan feel sad?
“五大电器”指()、()、()、避雷器、开关柜。