求lim(x->2)[(x+2)/(x^2+3x-10)]的极限.答案是无穷大(横着的8的符号).我想要具体的步骤!希望懂的人帮帮忙.还有一题:lim(x->0)[1-(1+2^2)]/x^2 (1+2^2)这个是有根号的,我手机打不出来,将就看了,知道就行.这

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