探索: (x-1)(x+1)=x2-1 (x-1)(x2+x+1)=x3-1 (
题型:解答题
问题:
探索:
(x-1)(x+1)=x2-1
(x-1)(x2+x+1)=x3-1
(x-1)(x3+x2+x+1)=x4-1
(x-1)(x4+x3+x2+x+1)=x5-1
…
(1)试求26+25+24+23+22+2+1的值.
(2)判断22008+22007+22006+…+22+2+1的值的个位数是几?
探索:
(x-1)(x+1)=x2-1
(x-1)(x2+x+1)=x3-1
(x-1)(x3+x2+x+1)=x4-1
(x-1)(x4+x3+x2+x+1)=x5-1
…
(1)试求26+25+24+23+22+2+1的值.
(2)判断22008+22007+22006+…+22+2+1的值的个位数是几?