极限LIM sin xy /x 的值为 A 0 ; B y C 2 ;D 3x趋于0 y趋于3
问题描述:
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
答
D
答
1
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