(7+1)(7^2+1)(7^4+1)(7^8+1)(7^16+1)=? 过程
2个回答
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(7+1)(7^2+1)(7^4+1)(7^8+1)(7^16+1)
=(1/6)(7-1)(7+1)(7^2+1)(7^4+1)(7^8+1)(7^16+1)
=(1/6)(7^2-1)(7^2+1)(7^4+1)(7^8+1)(7^16+1)
=(1/6)(7^4-1)(7^4+1)(7^8+1)(7^16+1)
=(1/6)(7^8-1)(7^8+1)(7^16+1)
=(1/6)(7^16-1)(7^16+1)
=(7^32-1)/6
=(1/6)(7-1)(7+1)(7^2+1)(7^4+1)(7^8+1)(7^16+1)
=(1/6)(7^2-1)(7^2+1)(7^4+1)(7^8+1)(7^16+1)
=(1/6)(7^4-1)(7^4+1)(7^8+1)(7^16+1)
=(1/6)(7^8-1)(7^8+1)(7^16+1)
=(1/6)(7^16-1)(7^16+1)
=(7^32-1)/6
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