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The mathematical vector of college entrance examination is more complicated.
Because: |a+b|? =|a|? +2a*b+|b|? So: 2a*b=|a+b|? -| One |? -|b|? Given the modulus of vector A = 13, the modulus of vector B = 19, | A+B | = 24, then: |a-b|? =|a|? -2a*b+|b|? =2|a|? +2|b|? -|a+b|? =2×( 13? + 19? )-24? =2×( 169+36 1)-576= 1060-576=484=22? So the solution is |a-b|=22