利用因式分解计算:(1-1⼀2^2)(1-1⼀3^2)......(1-1⼀100^2)

2025-01-31 10:15:55
推荐回答(1个)
回答1:

原式=(1-1/2)(1+1/2)(1-1/3)(1+1/3)(1-1/4)(1+1/4)......(1-1/99)(1+1/99)(1-1/100)(1+1/100)
=(1/2)[(3/2)(2/3)(4/3)(3/4)(5/4).....(98/99)(100/99)(99/100)](101/100)
=(1/2)*1*1*1....*1*(101/100)
=(1/2)(101/100)
=101/200