计算:(5+1)(5^2+1)(5^4+1)(5^8+1)(5^16+1)+1⼀4 (巧算)

计算: (5+1)(5^2+1)(5^4+1)(5^8+1)(5^16+1)+1/4 (巧算)
2024-10-29 19:17:35
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回答(1):

分子分母乘以5-1(平方差公式配平) 原式=(5-1)(5+1)(5^2+1)(5^4+1)(5^8+1)(5^16+1)/(5-1)+1/4 =(5^2-1)(5^2+1)(5^4+1)(5^8+1)(5^16+1)/4+1/4 =[(5^4-1)(5^4+1)(5^8+1)(5^16+1)+1]/4 =[(5^8-1)(5^8+1)(5^16+1)+1]/4 =[(5^16-1)(5^16+1)+1]/4 =[(5^32-1)+1]/4 =5^32/4