✨ Best Answer ✨
a･b=|a|･|b|cos30ﾟ
=2√3×√3/2=3
|3a－b|²=9|a|²－6a･b+|b|²
=9×4－6×3+3
=36－18+3
=21
|3a－b|>0より|3a－b|=√21
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