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Ta có:
- 20 = - 20
<=> 16 - 36 = 25 - 45
<=> 4^2 - 2.9/2.4 = 5^2 - 2.9/2.5
<=> 4^2 - 2.9/2.4 + (9/2)^2 = 5^2 - 2.9/2.5 + (9/2)^2 (cộng 2 vế cho (9/2)^2)
<=> (4 - 9/2)^2 = (5 - 9/2)^2 (hằng đẳng thức)
<=> 4 - 9/2 = 5 - 9/2
<=> 4 = 5.
C2:Ta có: 14 = 15 => 4 = 5
4=5 khi 1 tứ giác cắt đi 1 góc thành ngũ giác
nhớ tk cho mk nha
abc +ab +a = 126
=> 100a+10b+c+10a+b+a=126
=> 111a+11b+c=126
Vậy 111a<126 => a<1,135 (1)
và 10b+c<11.10+10=120
=> 11b+c<120 => 111a> 126-120=6 => a> 0,05 (2)
Từ (1) và (2) => a=1
a=1 => 111x1+11b+c=126
=>11b+c=15
=> 11b<15 => b<1,36 (3)
Vì c<10 nên 11b> 5=> b>0,45 (4)
Từ (3) và (4) => b=1
=> 11x1+c=15
=> c= 4
vậy số abc=114
câu 1 : là cái thẻ điện thoại thì mới có đến tận 13 chữ số giá nó bằng 500k
câu 2 :Muốn khuyên con người, nhất là lớp trẻ cần biết " chọn bạn để chơi " chọn những con người tốt đẹp để mà học những điều hay, điều phải trong cuộc sống
Học tốt!!!
đố vui giải nghĩa : gần mực thì đen gần đèn thì sáng
- "Gần mực thì đen" tức là nếu khi tiếp xúc, sử dụng mực mà không khéo, ta có thể bị vấy bẩn bởi mực, dễ bị lem nhem, xấu xí. "Gần đèn thì rạng" tức là nếu gần nơi có ánh sáng thì ta sẽ được soi tỏ bởi lớp ánh sáng ấy, dễ tỏa ra hào quang rực rỡ hơn người khác.
Câu đầu thì mk ko biết
Mk bị ngu toán nhé
Thông cảm
Hok tốt
vì chữ M là mát nên không cho vào tủ lạnh nữa
M trong tiếng anh gọi là "em".Em trong tủ lạnh cũng đồng nghĩa với từ tôi hoặc mình.Ai lại cho chính mình vào tủ đá!
dưới ánh nắng sương long lanh triệu cánh hồng khoe sắc khóe
[ đúng hơm hả kẹo ]
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12345:12345x12345:12345x12345 = 12345
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