С трёхлетнего возраста, если нет, то это мучение ,а не изучение, флирт и знакомство.Начните с планиметрии и вещественных чисел, если не вырвет, то греки до распиаренного Архимеда..
deedly deedlycan answer your questions in a Conversation
Using our site you are providing us with your express consent to place these cookies on your device in accordance with ourCookie Policy.If collected information contains personal data we will process it in accordance with ourPrivacy Policyand the.If collected information contains personal data we will process it in accordance with ourprivacy notice.
