♾️ có mấy số 0 ?
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Viết các số tự nhiên từ 1 đến 99. Hỏi:
a) Có mấy chữ số 2:20
b) Có mấy chữ số 0:9
I. Nội qui tham gia "Giúp tôi giải toán"
1. Không đưa câu hỏi linh tinh lên diễn đàn, chỉ đưa các bài mà mình không giải được hoặc các bài toán hay lên diễn đàn;
2. Không trả lời linh tinh, không phù hợp với nội dung câu hỏi trên diễn đàn.
3. Không "Đúng" vào các câu trả lời linh tinh nhằm gian lận điểm hỏi đáp.
Các bạn vi phạm 3 điều trên sẽ bị giáo viên của Online Math trừ hết điểm hỏi đáp, có thể bị khóa tài khoản hoặc bị cấm vĩnh viễn không đăng nhập vào trang web.
Ta co : so bi xanh luc dau bang 1/5 so bi do
Sau khi Phong co them 3 vien bi xanh nua thi so bi xanh do bang 1/4 do bi do .
1/4-1/5=1/20
Vậy số bi đỏ của Phong lúc đầu là:
3:1/20=60
Số bi xanh của Phong lúc đầu là :
60 : 5 = 12 (viên)
Vậy lúc đầu Phong có 60 viên bi đỏ và 12 viên bi xanh.
Vì 60 + 12 = 72 nên kết quả này thỏa mãn giả thiết về số bi của Phong không có quá 80 viên
**** nhe
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nhiều quá
:)) , 0 là tiền đề của cộng,trừ vô cùng , bạn cần giải mấy bài lim à ?