设A，B为两随机事件且<img class=jc-formula data-tex=B\subset A src=https://huaweicloudobs.ahjxjy.cn/625188EC2C532FE4854CE06AB57B5229.png style=vertical-align: middle;/>，则下列式子错误的有（）

【多选题】【消耗次数：1】

① P(AB)=P(B)

② P(AB)=P(A)

③ P(B|A)=P(B)

④ P(B-A)=P(B)-P(A)

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