Cho mình hỏi đáp án chính xác vớii ạa
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hnamyuh
23 tháng 2 2023
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2N
1
27 tháng 3 2022
-△ABC đều, đường cao AH.
\(\Rightarrow BH=CH=\dfrac{1}{2}BC=\dfrac{1}{2}a\)
-△ABH vuông tại H \(\Rightarrow AH^2+BH^2=AB^2\Rightarrow AH=\sqrt{a^2-\dfrac{1}{4}a^2}=\dfrac{\sqrt{3}}{2}a\)
-\(S_{ABC}=\dfrac{1}{2}.AH.BC=\dfrac{1}{2}.\dfrac{\sqrt{3}}{2}a.a=\dfrac{\sqrt{3}}{4}a^2\)
22 tháng 7 2021
31 - [ 26 - ( 209 + 35 ) ]
= 31 - ( 26 - 344 )
=31 - ( -318)
= 31 + 318 ( trừ trừ thành cộng nha )
= 349
22 tháng 7 2021
31-(26-(209+35)=31-
hok tốt
k cho mik
kb nữa nhé
TH
11 tháng 12 2021
Số thứ hai là:960 : 3 = 320
Tổng của 3số là:750 x 3 = 2250
Số thứ ba là:2250 - (960 + 320) = 970
11 tháng 7 2016
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
26 tháng 2 2017
500 con gà
600con vịt
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