cho mình hỏi : số đối của -4/5 là bao nhiêu ạq
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![](https://rs.olm.vn/images/avt/0.png?1311)
Mỗi lớp có số em là: 112 : 4 = 28 ( em )
Khối 5 có số học sinh nam là: 112 : 7 . 3 = 48 ( em )
Khối 5 có số học sinh nữ là: 112 - 48 = 64 ( em )
Còn chỗ nào chưa hiểu, cứ hỏi :)
Hk tốt
![](https://rs.olm.vn/images/avt/0.png?1311)
Theo bài ra, ta có: 2/5 nam và 4/7 nữ là 140 bạn hay số bạn nam và 10/7 số bạn nữ là 350 ; và 5/6 nam nhiều hơn 9/14 nữ là 35 bạn hay số bạn nam nhiều hơn 27/35 số bạn nữ là 42 bạn.
Do đó: (10/7 +27/35)số bạn nữ = 11/5 số bạn nữ bằng:
350 - 42 = 308(bạn)
Số bạn nữ là:
308:(11/5) = 140(bạn)
Số bạn nam là:
350 - 140x(10/7)= 150(bạn)
Đáp số: nam: 150 bạn
nữ: 140 bạn
![](https://rs.olm.vn/images/avt/0.png?1311)
Mình không nghĩ ra nên bạn tham khảo nhé :
Nguồn : http://gdthhatinh.violet.vn/
Theo bài ra \(\frac{2}{5}\)số gà ít hơn \(\frac{2}{3}\)số vịt là 200 con
Vậy, \(\frac{6}{5}\)số gà ít hơn 2 lần số vịt là:
200 x 3 = 600 (con)
Hay \(\frac{3}{5}\)số gà ít hơn vịt là
600 : 2 = 300 con (1)
Mặt khác, \(\frac{3}{4}\)số gà nhiều hơn \(\frac{5}{12}\)số vịt là 125 con
Nên 9 lần số gà nhiều hơn 5 lần số vịt là:
125 x 12 = 1500 (con)
Hay \(\frac{9}{5}\)số gà nhiều hơn số vịt là:
1500 : 5 = 300 con (2)
Từ (1) và (2) ta có:
\(\frac{9}{5}\)số gà nhiều hơn \(\frac{3}{5}\)số gà số con là
300 + 300 = 600 (con)
Phân số chỉ số phần của 600 con gà là:
\(\frac{9}{5}-\frac{3}{5}=\frac{6}{5}\)
Số gà là:
600 x 5 : 6 = 500 (con)
Số vịt là:
3 x 500:5 + 300 = 600 (con)
Đáp số: 500 con gà
600 con vịt
500 con gà
600con vịt
ĐÚNG 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000%
so doi cua -4/5 la:4/5 ;**** cho minh nhe !