问题
填空题
设m是正实数．若椭圆
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答案
∵a2=m2+16，b2=9，
∴c2=m2+16-9=m2+7，
∴2c=8，
∴
=4，⇒m=3m2+7
故答案为：3．
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设m是正实数．若椭圆
|
∵a2=m2+16，b2=9，
∴c2=m2+16-9=m2+7，
∴2c=8，
∴
=4，⇒m=3m2+7
故答案为：3．
补全对话。从方框中选择最佳选项完成对话,有两项多余。
A: Dale, why are you so happy? B: Well, Dad, __1__ A: Oh, did you do it well? B: Yes, __2__ A: Well done! Congratulations ! I'm glad that you won the first prize. B: __3__ I have finished it in half an hour. A: Great! But did you check it carefully? B: Yes, and when I checked it carefully, __4__ Then I corrected it quickly. A: You are right.__5__ B: I know, Dad. Thanks. |