数学II Bベクトルの問題です ⑴から教えてください お願いします
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![(2)[1]の式はなぜこうなるのでしょうか？
解説お願いします🙏🏻 - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1810073/thumb_l_webp_1717B3E3-8A84-49A5-82D1-466207496D96.webp?Expires=1787304138&Signature=bSDZ8tXqf8Ypkeq1MKAuxCWTPPJ31qNHRnTJj9AIOi2iZeQOfU2ezjP62H1LQuGAhF8Urkmrx4wEXf04O3nVQNEpQWA2ACBwAG6So3-br-oSs978xQY52F0WbwOjxlAGWPY0dwV296QgRlhGqbBHxkYbjvBfwY11xyR0Q9T1mKipfZZ906Z3zZNEgCVqVIQiiIs-563wYB33KPHJclPp9w1HaeY3zSm6L2KYTZFy88p7mIlQoE-A7vAF5oP1SYaQeRitwCKf2suaVJRYbCDN9s2i~5XSSwyR7b~K0ob2ED04dFj17CxLLWqXQtOguKmg4XgkJyxliTacDYekCD3HMg__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787304138&Signature=njuOZCS3QI2sEqjOvO8ZtF4BU8t-x0vBGwF9WRLjEGbUta8M0HKwtbMhSLDitSvOxdMpXHM92xlTgwC2l5KJixygL7qbkc8Arx1-vsJJrT5ju7V37SPZTrMhsCCoyu2nLeZESKWWqKwibmTejLZOhmcTp9zeLkhK6ANkD9F9UYYLyGi4qm8YcW-Y81cuyGN2JJRWLJWzlKthFi7g~Do0DTpfudZVlFT0UBlIrrdZZUVkzZTWDENJotDKViffQj2Kw~IBM030JuWSSYbXuichYEYFlEpSFdzJIKRvO5aL7MUoxRb6XAOx2xm73oNFPhqXVBVb8PzFG0bjHJM1RdVQ5g__&Key-Pair-Id=K2W722D70GJS8W)
