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Gọi số thứ nhất, hai , ba theo thứ tự đề bài là a, b và c.
Theo đề bài, ta có (a+b+c):3 = 126 ; a - b = 15 suy ra a = b+15 ; b - c =9 suy ra c = b - 9
Do đó \(\frac{a+b+c}{3}=126\Rightarrow b+15+b+b-9=378\Rightarrow3b=372\Rightarrow b=124\Rightarrow c=124-9=115\)
Vậy số thứ ba là 115
Số thứ nhất là :
( 2400 - 200 ) : 2 = 1100
Tổng 2 số con lại là :
2400 - 1100 = 1300
Số thứ hai là :
( 1300 + 50 ) : 2 = 675
Số thứ ba là :
675 - 50 = 625
Đáp số : 625; 675 và 1100
Hai thùng dầu chứa 40 l dầu. Nếu lấy 5l ở thùng thứ nhất đổ vào thùng thứ hai thì số dầu chứa trong hai thùng bằng nhau. Hỏi mỗi thùng chứa bao nhiêu lít dầu?
trong chuồng nhà Yến có 7con gà trống. Hỏi tổng của cánh gà và chân gà là bao nhiêu?
số thứ nhất là : 948
số thứ hai là : 145
số thứ 3 là : 912
Bài giải
Tổng số thứ hai và số thứ ba là :
( 2005 + 109 ) : 2 = 1057
Số thứ nhất là :
2005 - 1057 = 948
Số thứ hai là :
( 1057 + 36 ) : 2 = 546,5
Số thứ ba là :
1057 - 546,5 = 510,5
Đ/S :...
số thứ nhất là:
(2005-109):2=948
tổng của hai số còn lại là:
2005-948=1057
số thứ 2 là:
(1057+36): 2=546.1
số thứ 3 là:
1057-546.1=511.1
Số thứ nhất là :
( 1978 + 58 ) : 2 = 1018
Tổng của số thứ hai và số thứ ba là :
1978 – 1018 = 960
Số thứ hai là :
( 960 + 36 ) : 2 = 498
Số thứ ba là :
498 – 36 = 462
Giải:
Nếu số thứ nhất bớt đi 126 và số thứ ba thêm vào 63 thì ba số bằng nhau và bằng số thứ hai lúc đầu.
Tổng ba số khi đó là:
945 - 126 + 63 = 882
Số thứ hai là: 882 : 3 = 294
Số thứ nhất là: 294 + 126 = 420
Số thứ ba là: 294 - 63 = 231
Đáp số: Số thứ nhất 420
Số thứ hai 294
Số thứ ba là 231
Số thứ nhất là