观察下列各式:2⼀1X2=2⼀1+2,3⼀2x3=3⼀2+3,4⼀3x4=4⼀3+4,5⼀4x5=5⼀4+5,......

2024-12-30 16:38:11
推荐回答(1个)
回答1:

(n+1)/nX(n+1)=(n+1)/n+(n+1) (n大于等于1)