极限LIM sin xy /x 的值为 A 0 ； B y C 2 ;D 3
x趋于0 y趋于3
人气：499 ℃ 时间：2020-04-05 10:38:20
解答
lim(x->0,y->3)sin(xy)/x
=lim(x->0,y->3)sin(xy)/(xy)*y
=lim(x->0,y->3)sin(xy)/(xy)*lim(y->3)y
=1*3
=3
选D
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