观察下列各式:(x 2 -1)÷(x-1)=x+1(x 3 -1)÷(x-1)=x 2 +x+1(x 4 -1)÷(x-1)=x 3 +x 2 +x+1
观察下列各式:(x2-1)÷(x-1)=x+1(x3-1)÷(x-1)=x2+x+1(x4-1)÷(x-1)=x3+x2+x+1(x5-1)÷(x-1)=x4+x3+x2...
观察下列各式:(x 2 -1)÷(x-1)=x+1(x 3 -1)÷(x-1)=x 2 +x+1(x 4 -1)÷(x-1)=x 3 +x 2 +x+1(x 5 -1)÷(x-1)=x 4 +x 3 +x 2 +x+1…(1)写出(x 6 -1)÷(x-1)的结果;(2)将x 6 -1表示成两个多项式乘积的形式.
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(1)∵(x 2 -1)÷(x-1)=x+1, (x 3 -1)÷(x-1)=x 2 +x+1, (x 4 -1)÷(x-1)=x 3 +x 2 +x+1, (x 5 -1)÷(x-1)=x 4 +x 3 +x 2 +x+1, ∴(x n -1)÷(x-1)=x n-1 +x n-2 +…+1, ∴(x 6 -1)÷(x-1)=x 5 +x 4 +x 3 +x 2 +x+1; (2)∵(x 6 -1)÷(x-1)=x 5 +x 4 +x 3 +x 2 +x+1, ∴x 6 -1=(x-1)(x 5 +x 4 +x 3 +x 2 +x+1). |
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