質問: 7 10 詳解 7 10 詳解
回答: 第10題 原式=-7×(-7)^4+6×(-7)^4-4×(-7)^3+25×(-7)^2+30×(-7)+20 =-1×(-7)^4-4×(-7)^3+25×(-7)^2+30×(-7)+20 =7×(-7)^3-4×(-7)^3+25×(-7)^2+30×(-7)+20 =3×(-7)^3+25×(-7)^2+30×(-7)+20 =-21×(-7)^2+25×(-7)^2+30×(-7)+20 =4×(-7)^2+30×(-7)+20 =-28×(-7)+30×(-7)+20 =2×(-7)+20 =(-14)+20 =6 (裡面的^n→n次方)