简易数学 (Math Learner)
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- 通过各个级别学习并掌握主要的数学运算！ 将来会陆续添加新内容！
You can subscribe for access to the full list of Math lessons.
Subscriptions are from $9.99 USD weekly, $29.99 USD monthly and $99.99 USD annually*.
Payment will be charged to iTunes Account at confirmation of purchase.
You will be able to do all exercises for the duration of the subscription.
Subscription automatically renews for the same price and duration period as the original ""one week""/""one month""/""one year"" package unless auto-renew is turned off at least 24-hours before the end of the current period.
Account will be charged for renewal within 24-hours prior to the end of the current period at the cost of the chosen package (weekly, monthly or yearly package).
Subscriptions may be managed by the user and auto-renewal may be turned off by going to the user's iTunes Account Settings after purchase.
No cancellation of the current subscription is allowed during active subscription period.
You may cancel a subscription during its free trial period via the subscription setting though your iTunes account. This must be done 24 hours before the end of the subscription period to avoid being charged. Please visit: http://support.apple.com/kb/ht4098 for more information.
You may turn off the auto-renewal of your subscription via your iTunes Account Settings. However, you are not able to cancel the current subscription during its active period.
Any unused portion of free-trial period, will be forfeited when the user purchases an app subscription.
* Prices are equal to the value that ""Apple's App Store Pricing Matrix"" determines as the equivalent of the subscription price in $ USD