问题
选择题
下列因式分解中，结果正确的是（ ）
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答案
A、应为2m2n-8n3=2n（m2-4n2）=2n（m+2n）（m-2n），故本选项错误；
B、x2-4=（x+2）（x-2），正确；
C、应为x2-x+
=（x-1 4
）2，故本选项错误；1 2
D、应为9a2-9b2=9（a2-b2）=9（a+b）（a-b）故本选项错误．
故选B．
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下列因式分解中，结果正确的是（ ）
|
A、应为2m2n-8n3=2n（m2-4n2）=2n（m+2n）（m-2n），故本选项错误；
B、x2-4=（x+2）（x-2），正确；
C、应为x2-x+
=（x-1 4
）2，故本选项错误；1 2
D、应为9a2-9b2=9（a2-b2）=9（a+b）（a-b）故本选项错误．
故选B．
I ran into a stranger as he passed by. "I'm so 36 !" was my reply. Then he said, "Excuse me too. I wasn't even 37 you" .We were very polite, this stranger and I. 38 at home, a different story is told---how we 39 our loved ones. While I was cooking ,my daughter came up to me quietly. When I 40 , I nearly knocked her down. "Get out of the way! "I barked She ran away, with her little heart broken. I didn't realize how 41 I'd spoken. That night, as I lay 42 in bed, God's quiet voice spoke to me and said, "While 43 with a stranger, you're calm and polite, but with those you love, you're quick to 44 . Go and look right now on the kitchen floor. You'll 45 some flowers there by the door. Those are the flowers she brought for you. She 46 them herself. She stood there _ 47 , not to spoil your surprise, and you never saw the tears in her eyes." 48 this time, I felt sad and my own tears had begun to 49 . "Are these the flowers you picked for me?" I asked. She 50, "I found them out by the tree. 1 knew you'd like them." I said, "I'm so sorry that I 51 them today. And I shouldn't have shouted at you that way." She whispered, “Mommy, that's okay... I still love you 52 .” I hugged her. Are you aware that if you die tomorrow, the company that you are working for could easily 53 you in a matter of days? But the family you leave behind will feel the 54 for the rest of their lives. And come to think of it, we 55 more into our work than into our families –an unbalanced investment (投资) indeed.
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