830613li
幼苗
共回答了26个问题采纳率:84.6% 举报
5*2^6-6*2^4+(1/4)*2^7
=5*2*2^5-3*2*2^4+2^(-2)*2^7
=10*2^5-3*2^5+2^5
=(10-3+1)*2^5
=8*2^5
=2^3*2^5
=2^8
设 S=2-2^2-2^3-.2^99-2^100
则2s=2^2-2^3-.2^99-2^100-2^101
s
=2s-s
=2^2-2^3-.2^99-2^100-2^101-(2-2^2-2^3-.2^99-2^100)
=2^2-2^3-.2^99-2^100-2^101-2+2^2+2^3+.2^99+2^100)
=2^2+2^2-2-2^101
=6-2^101
(=-2535301200456458802993406410746)
1年前
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