change of variable theorem变量: variable; variable quantity; ...更换: renewal; change; replace; tr ...定理: theorem变量更换方法: change of variable technique变量变换定理: change-of-variable theorem下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:变量更换定理，即可在微信中查询翻译
