高数极限问题,如何证明这个数列yn有上界?急!跪求大神!
1个回答
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根号打不出来,用()……0.5代替了
y1=(a+(a)^0.5)^0.5<{[(a)^0.5]^2+2(a)^0.5+1}^0.5<(a)^0.5+1
y2=(a+y1)^0.5<(a+(a)^0.5+1)^0.5<{[(a)^0.5]^2+2(a)^0.5+1}^0.5<(a)^0.5+1
y3=(a+y2)^0.5<(a+(a)^0.5+1)^0.5<{[(a)^0.5]^2+2(a)^0.5+1}^0.5<(a)^0.5+1
.......
yn=(a+yn-1)^0.5<(a+(a)^0.5+1)^0.5<{[(a)^0.5]^2+2(a)^0.5+1}^0.5<(a)^0.5+1
极限是(a)^0.5+1
y1=(a+(a)^0.5)^0.5<{[(a)^0.5]^2+2(a)^0.5+1}^0.5<(a)^0.5+1
y2=(a+y1)^0.5<(a+(a)^0.5+1)^0.5<{[(a)^0.5]^2+2(a)^0.5+1}^0.5<(a)^0.5+1
y3=(a+y2)^0.5<(a+(a)^0.5+1)^0.5<{[(a)^0.5]^2+2(a)^0.5+1}^0.5<(a)^0.5+1
.......
yn=(a+yn-1)^0.5<(a+(a)^0.5+1)^0.5<{[(a)^0.5]^2+2(a)^0.5+1}^0.5<(a)^0.5+1
极限是(a)^0.5+1
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