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Vector Mathematics Problems in Vocational Schools
A: vector AB+ vector BA=2 vector AB

Wrong, because vector AB=- vector BA, vector AB+ vector BA= vector 0.

B: vector AB- vector BA= vector 0.

Wrong, it should be equal to: 2 vector AB. (The reason is the same as above)

C: vector AB= vector CA- vector CB.

Wrong. Vector AB= vector CB- vector CA.

D: vector CD= vector AD- vector AC

Correct.