| Thành viên thường |
Thành viên VIP |
|
|---|---|---|
| Học và làm bài tập | 3 - 5 bài miễn phí (chọn sẵn) | Tất cả (không giới hạn) |
| Xem đáp án, lời giải chi tiết | ||
| Làm bài kiểm tra | Tất cả (không giới hạn) | |
| Toán vui mỗi ngày | ||
| Toán vui mỗi tuần | ||
| Thi đấu kiến thức | Không giới hạn | |
| Hỏi đáp nhanh | ||
| Danh sách bạn bè | Tối đa 50 bạn | Tối đa 200 bạn |
| Xem bài giảng video (Sắp ra mắt) |
Xem toàn bộ, không giới hạn |
|
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Hỏi đáp Toán lớp 5 - Tính tuổi
Tuổi con gái bằng 1/4 tuổi mẹ, tuổi con trai bằng 1/5 tuổi mẹ. Tuổi của con gái cộng với tuổi của con trai là 18 tuổi. Hỏi mẹ bao nhiêu tuổi?
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