A.年折舊率=（1－預(yù)計(jì)凈殘值率）÷折舊年限×100%，季折舊額=原值×年折舊率÷4，月折舊額=原值年折舊率÷12
B.每工作1小時(shí)折舊額=原值÷（1－預(yù)計(jì)凈殘值率）÷規(guī)定的工作小時(shí)，單位里程折舊額=原值×（1－預(yù)計(jì)凈殘值率）÷規(guī)定的總行駛里程
C.年折舊率=2÷折舊年限×100%，季折舊額=凈值×年折舊率÷4，月折舊額=凈值×年折舊率÷12
D.年折舊率=2×（折舊年限－已使用年數(shù)）÷折舊年限×（折舊年限+1）×100%，季折舊額=原值×（1－預(yù)計(jì)凈殘值率）×年折舊率÷4，月折舊率=原值×（1－預(yù)計(jì)凈殘值率）×年折舊率÷12