计算:(﹣2)2+[18﹣(﹣3)×2]÷4.
解:原式=4+24 ÷4
=10
The experiment show that proper amount of exercise, if ________ regularly, can improve our health. [ ]
A. carry out
B. carried out
C. to carry out
D. being carried out
方程中出现的未知函数及其各阶导数都是一次幂形式的微分方程称为线性微分方程。