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> 当a=99时,分式a2-1a-1的值是______.-数学
当a=99时,分式a2-1a-1的值是______.-数学
题目简介
当a=99时,分式a2-1a-1的值是______.-数学
题目详情
当a=99时,分式
a
2
-1
a-1
的值是______.
题型:填空题
难度:中档
来源:连云港
答案
∵a2-1=(a+1)(a-1),
∴
a
2
-1
a-1
=
(a-1)(a+1)
a-1
=a+1
;
当a=99时,a+1=100.
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题目简介
当a=99时,分式a2-1a-1的值是______.-数学
题目详情
答案
∴
当a=99时,a+1=100.