1.解(1)-3^4=-(3×3×3×3)=-81;
(2)-(-3)³=-【(-3)×(-3)×(-3)】=27;
(3)-(2/3)^4=-(2/3×2/3×2/3×2/3)=- 16/81;
(4)(4/5)²=4/5×4/5=16/25;
(5)- 3/2²=-3/(2×2)=-3/4;
(6)-(-2/5)³=-【(-2/5)×(-2/5)×(-2/5)】=8/125.
2.解:(1/2)^7=1/128(m).
因此第7次后剩下的木棒有1/128m长.
3.解:(1)1/2×1/2×1/2×1/2×1/2×1/2=〖(1/2)〗^6=1/64;
※(2)1/2+1/4+1/8+…+1/2^6 =1-1/64=63/64.