1) "|r_1|=\\sqrt{2^2+(-5)^2+7^2}=\\sqrt{78}."
"u_1=\\frac{2}{\\sqrt{78}}i-\\frac{5}{\\sqrt{78}}j+\\frac{7}{\\sqrt{78}}k"
2) "|r_2|=\\sqrt{3^2+8^2+(-1)^2}=\\sqrt{74}" .
"u_2=\\frac{3}{\\sqrt{74}}i+\\frac{8}{\\sqrt{74}}j-\\frac{1}{\\sqrt{74}}k"
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