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)÷(
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:(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+x+1…观察上面的规律计算:1+2+22+…+262+263=______.
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