(1-n^2)/(2+n^2)+(-3/4)^n的极限要过程
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(1-n^2)/(2+n^2)+(-3/4)^n的极限要过程
(1-n^2)/(2+n^2)+(-3/4)^n的极限
要过程
(1-n^2)/(2+n^2)+(-3/4)^n的极限要过程
=-1+0=-1
原式=(1-n2)/(2+n2)-((3/4)^n)(-1)^n
把n2看成整体,n无穷大,n2无穷大,+前面的等于分子变量的系数/分母变量的系数=-1,加号后面(3/4)^n<1,当n无穷大时,值趋向于0
所以,极限值为-1+0=-1
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