Prove by matheatical induction that for all positive integers n,
1^3+3^3+5^3+............+(2n - 1)^3=(2n^2 - 1)
Think 左好耐好想知點解 thx~
更新1:
真係唔該晒!其實前面一半我都做到, 但到咗後面: 2k^4+8k^3+11k^2+6k+1 點樣可以好快諗到下一步: (k^2+2k+1)(2k^2+4k+1) 呢方面我比較弱, 麻煩教一教個思維, thanks a lot!!
