原式=2(3+1)(3二次+1)(3四次+1)...(3三十二次+1)/2-3六十四次/2
=(3-1)(3+1)(3二次+1)(3四次+1)...(3三十二次+1)/2-3六十四次/2
=(3二次-1)(3二次+1)(3四次+1)...(3三十二次+1)/2-3六十四次/2
=(3四次-1)(3四次+1)...(3三十二次+1)/2-3六十四次/2
反复用平方差
=(3六十四次-1)/2-3六十四次/2
=(3六十四次-1-3六十四次)/2
=-1/2
原式=2(3+1)(3二次+1)(3四次+1)...(3三十二次+1)/2-3六十四次/2
=(3-1)(3+1)(3二次+1)(3四次+1)...(3三十二次+1)/2-3六十四次/2
=(3二次-1)(3二次+1)(3四次+1)...(3三十二次+1)/2-3六十四次/2
=(3四次-1)(3四次+1)...(3三十二次+1)/2-3六十四次/2
反复用平方差
=(3六十四次-1)/2-3六十四次/2
=(3六十四次-1-3六十四次)/2
=-1/2