A、<img src="https://learning.mhtall.com/upload/uc_course/10718/479AA0935436CAAA13D4B48F8B2EBD0872E8C703.png" alt="">
B、E-A
C、E+A
D、<img src="https://learning.mhtall.com/upload/uc_course/10718/381DA3F4D2F9AB83C52BC7D61DDA7A3D164460E4.png" alt="">
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