Ответы на вопрос:
a⃗ {8;−15} |a⃗ |=17
b⃗ {−15;8} ∣∣b⃗ ∣∣=17
a⃗ {30;−16} |a⃗ |=xa2+ya2−−−−−−−−√=(30)2+(−16)2−−−−−−−−−−−−√=34
b⃗ {−16;30} ∣∣b⃗ ∣∣=xb2+yb2−−−−−−−−√=(−16)2+(30)2−−−−−−−−−−−−√=34
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