Calculadora para Pad

Probé todas las calculadoras del mercado y tuve varios problemas. Hicimos una calculadora que podría ser más fácil de usar. Las características principales son las siguientes:
1. Sin anuncios, no se agregarán anuncios en el futuro
2. Admite cálculo simple y cálculo científico.
3. Se pueden ver los pasos de cálculo y el proceso de cálculo
4. Admite visualización en mayúsculas chinas
5. Optimizado para Pad de alta resolución
6. Tamaño muy pequeño sin ocupar espacio de almacenamiento
Subscription instructions:
—1 subscription option to choose from. Our standard subscription options are:
Subscribe for1week /1month/1year
—The subscription fee will be paid through the credit card attached to your iTunes account.
-Unless your subscription is cancelled at least 24 hours before the end of the current period, your subscription will be automatically renewed.
—You can manage your subscriptions on your account. You can cancel your subscription or trial at any time by going to the iTunes account settings and canceling the subscription, otherwise it will automatically renew.
—The account will be charged for renewal within 24 hours before the end of the current period, and you will not be able to cancel the subscription within the validity period.
—When purchasing a premium subscription during the free trial period, any unused portion of the free trial period (if provided) will be confiscated.
—For more information, please refer to our "Privacy Agreement" and "Member Service Agreement"
"Privacy Agreement" https://www.jianshu.com/p/3ce508010a23
"Member Service Agreement" https://www.jianshu.com/p/40d4f8cf7b90