A:finished
B:to finish
C:finishing
D:to be finished
一架飞机沿最大纬线圈以每小时100千米的速度作环球飞行,大约需( )
— I'm sorry to hear that.
x4 + x−12 =1的解是x=2,
x6 + x−22 =1的解是x=3,
x8 + x−32 =1的解是x=4,
…
根据观察得到的规律,写出其中解是x=6的方程:____.
Before, I was quiet. Now, I'm very active in class.
____