(3+1)(3^2+1)(3^4+1)(3^8+1)=?
问题描述:
(3+1)(3^2+1)(3^4+1)(3^8+1)=?
答
原式=(3-1)(3+1)(3^2+1)(3^4+1)(3^8+1)/(3-1)
=(3^2-1)(3^2+1)(3^4+1)(3^8+1)/(3-1)
=(3^4-1)(3^4+1)(3^8+1)/(3-1)
=(3^8-1)(3^8+1)/(3-1)
=(3^16-1)/2没看懂,请再指点上下乘3-1
采纳吧马上采纳,但我实在看不懂,第2步(3^2-1)是哪里来的?第三步3^4-1也没看明白是哪里冒出来的。多多指点平方差!!!!!!!!
采纳