假如光速只有3m/s,写出一个场景:______.
假如光速只有3m/s,则光速就会比声速小得多,所以就会出现打雷时,先听见雷声后看见闪电.
故答案为 先听见雷声后看见闪电.
It is not wise for you to take ________ for granted that the problem is easy________.[ ]
A. it; to be solved
B. it; to solve
C. that; to be solved
D. that; to solve right
分解因式:3x3﹣27x=( )