问题
解答题
先化简,再选择一个你喜欢的整数代入求值,(
|
答案
(
+2 a-1
)÷a-2 a2-1
,a a+1
=【
+2(a+1) (a-1)(a+1)
】÷a-2 (a+1)(a-1)
,a a+1
=
×2a+2+a-2 (a+1)(a-1)
,a+1 a
=
;3 a-1
取a=-2,得原式=-1.(-3<a<2.且a≠±1,计算正确都给分.)
先化简,再选择一个你喜欢的整数代入求值,(
|
(
+2 a-1
)÷a-2 a2-1
,a a+1
=【
+2(a+1) (a-1)(a+1)
】÷a-2 (a+1)(a-1)
,a a+1
=
×2a+2+a-2 (a+1)(a-1)
,a+1 a
=
;3 a-1
取a=-2,得原式=-1.(-3<a<2.且a≠±1,计算正确都给分.)