(2x-1)的5次方=﹙2x﹚^5+5×(2x)^4×﹙-1﹚+10×(2x)³×﹙-1﹚²+10×﹙2x﹚²×﹙-1﹚³+5×2x×﹙-1﹚^4+﹙-1﹚^5=32x^5-80x^4+80x³-40x²+10x-1=ax的5次方+bx的4次方+cx的3次方+dx的2次方+ex+f∴a=32, c=80, e=10a+c+e=122