Where to put pictures?

ionic-v1
#1

Hi, I made an application and after generating the apk the images do not appear follow the code with the way I am using

<ion-content padding style = "background-image: url(/assets/imagens/numbers.jpg);">
	<ion-card>
  <img src="/assets/imagens/{{tela.foto}}.png"/>
   	<ion-card-content>
   		<ion-card-title>
    		 {{tela.titulo}}  
      </ion-card-title>  
 		</ion-card-content>
 		<a class= "about_botao"(click)= "dinamica_jogo(1)">SIM</a>
 		<a class= "about_botao"(click)= "dinamica_jogo(0)">NAO</a>
    <hr/>
	</ion-card>
</ion-content>
#3

I always use:

background: url('../assets/img/splash.jpg');
#4