题目

   He met her at the party. She was so outstanding, with many boys around her, while he was so normal, with nobody paying attention to him.    At the end of the party, he invited her to have coffee with him. She was surprised, but due to being polite, she agreed. They sat in a nice coffee shop. He was too nervous to say anything, and she felt uncomfortable, thinking, “Please let me go home.” Suddenly he asked the waiter, “Would you please give me some salt? I'd like to put it in my coffee.” Everybody stared at him——so strange! His face turned red, but, still, he put the 先估计各算式中的另一个因数，然后用计算器检验．如果你的估计不在后面的积的范围内，再用另一个数试一试．你能写出几个？69×7070    4500～480088×9090    7900～8100303×1515    4400～4700397×88    3000～3300．