Giúp mik vs đg cần gấp ạ
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Câu 3:
a: Áp dụng tính chất của dãy tỉ số bằng nhau, ta được:
\(\dfrac{x}{3}=\dfrac{y}{2}=\dfrac{x+y}{3+2}=\dfrac{90}{5}=18\)
Do đó: x=54; y=36
các anh chiến sĩ thật gan dạ, quả cảm và đầy tình yêu thương.
1 từ: dũng cảm
1 câu: Những anh bộ đội trong bức ảnh đã không ngại gian khổ, dũng cảm vào dòng nước lũ để giúp đỡ người dân.
\(21,B\\ 22,B\\ 23,C\\ 24,A\\ 25,B\\ 16,C\\ 17,C\\ 18,D\\ 19,B\\ 20,A\)
Hóa bạn qua bên box Hóa đăng nhé
Bài 1:
a. \(p=dh=10300\cdot36=370800\left(N/m^2\right)\)
b. \(160cm^2=0,016m^2\)
\(p=\dfrac{F}{S}\Rightarrow F=S\cdot p=0,016\cdot370800=5932,8\left(N\right)\)
Bài 2:
Ta có: \(p_2>p_1\left(1165000>875000\right)\)
\(\Rightarrow\) Tàu đăng lặn xuống, vì khi càng xuống áp suất lại càng tăng.
\(\left\{{}\begin{matrix}p'=dh'\Rightarrow h'=\dfrac{p'}{d}=\dfrac{875000}{10300}\approx84,9\left(m\right)\\p''=dh''\Rightarrow h''=\dfrac{p''}{d}=\dfrac{1165000}{10300}\approx113\left(m\right)\end{matrix}\right.\)
Bạn cần bài nào ạ? Nếu cần tất cả các bài trên thì bạn tách ra từng CH khác nhau nhé, đăng vào 1 câu tỉ lệ giúp sẽ ít, chất lượng làm bài không được cao.
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