(3*3^1/2)^(-1/3)*
*корень((3^3)^2/3-(7^2)^0,5)/21=
=(3^3/2)^(-1/3)*корень(3^2-7)/21=
=3^(-1/2)*корень(9-7)/21=
=1/3^2 *корень2/21 =1/9 *корень2/21
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(3*3^1/2)^(-1/3)*
*корень((3^3)^2/3-(7^2)^0,5)/21=
=(3^3/2)^(-1/3)*корень(3^2-7)/21=
=3^(-1/2)*корень(9-7)/21=
=1/3^2 *корень2/21 =1/9 *корень2/21