(64)^1/6+5(512)^1/3-2(343)^2/3
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(64)^1/6+5(512)^1/3-2(343)^2/3
=(2)6×1/6+5(2)^9×1/3-2(7)^3×2/3
=2+5(2)3-2(7)^2
=2+5×8-2×49
=2+40-98
=42-98
= -56
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