(3 root 343 to power -2)/(4 root 81)
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(3√343)^(-2)/4√81
=7^-2/3
=1/3×7^-2
=1/3×1/49
=1/147
=7^-2/3
=1/3×7^-2
=1/3×1/49
=1/147
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