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Gọi số đó là : abcd . Số mới là 1abcd . Ta có :
1abcd = abcd . 6
10000 + abcd = abcd . 6
10000 = abcd . 5 ( Rút gọn đi ở cả hai vế 1 số abcd )
abcd = 10000 : 5
abcd = 2000
Vậy số đó là : 2000.
Đáp số : 2000.
Có chân mà chẳng biết đi Quanh năm suốt tháng nằm ì một nơiLà gì?Gợi ý: Có 9 chữ
đó là : cái giường, ... vv
lưu y không được đăng nhưng câu hoi khong liên quan đến toán học
câu dễ
1 = 5
2 = 15
3 = 215
4 = 3215
5 = ?
Có hai đáp án
gợi ý : trong game brain out sẽ có
25-45=16=36
5^2-2.5.9/2+(9/2)^2-(9/2)^2= 4^2-2.4.9/2+(9/2)^2-(9/2)^2
(5-9/2)^2 -(9/2)^2 = (4-9/2)^2-(9/2)^2
(5-9/2)^2=(4-9/2)^2
5-9/2=4-9/2
5=4
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mình in đậm rùi đó
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