а.√3/2 * √2/2 * √3/3 = √18/2 = 3√2/12 =√2/4
б.0-2/3*(-1)-1/3*(-1)=2/3+1/3=3/3=1
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а.√3/2 * √2/2 * √3/3 = √18/2 = 3√2/12 =√2/4
б.0-2/3*(-1)-1/3*(-1)=2/3+1/3=3/3=1