(9/2-2x)x1 4/7=11/14
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a) Ta có:\(x\in\left\{23;24;25;26\right\}\)
\(56-x⋮8\Rightarrow x⋮8\)
\(\Rightarrow x=24\)
b) Ta có: \(x\in\left\{22;24;45;48\right\}\)
\(60+x⋮̸\)\(6\Rightarrow x⋮̸\)\(6\)
\(\Rightarrow x=22;45\)
a) \(\overline{48x5y}\) có tổng các chữ số là \(4+8+x+5+y=x+y+17\)
mà \(\overline{48x5y}⋮\left(2;3;5\right)\)
\(\Rightarrow\left\{{}\begin{matrix}y=0\\x+y+17:3\end{matrix}\right.\)\(\Rightarrow\left\{{}\begin{matrix}y=0\\x\in\left\{1;4;7\right\}\end{matrix}\right.\)
\(D=\dfrac{21^2.14^{126}}{126^{35}.5^6}=\dfrac{7^2.3^2.14^{126}}{14^{35}.9^{35}.5^6}=\dfrac{7^2.3^2.14^{91}}{3^{70}.5^6}\)
\(D=\dfrac{7^2.7^{91}.2^{91}}{3^{68}.5^6}=\dfrac{7^{93}.2^{91}}{3^{68}.5^6}\)
Theo đề ta có y = ax, x = bz. Suy ra y = ax = abz.
Vậy y tỉ lệ thuận với z theo hệ số tỉ lệ ab
\(\left(\dfrac{9}{2}-2x\right)\cdot1\dfrac{4}{7}=\dfrac{11}{14}\\ \\\\ \Rightarrow\left(\dfrac{9}{2}-2x\right)\cdot\dfrac{11}{7}=\dfrac{11}{14}\\ \\\\ \Rightarrow\dfrac{9}{2}-2x=\dfrac{11}{14}:\dfrac{11}{7}=\dfrac{11}{14}\cdot\dfrac{7}{11}=\dfrac{1}{2}\\ \\ \\ \Rightarrow2x=\dfrac{9}{2}-\dfrac{1}{2}=\dfrac{8}{2}=4\\ \\ \\ \Rightarrow x=4:2=2\)
(\(\dfrac{9}{2}\) - 2\(x\)) \(\times\) 1\(\dfrac{4}{7}\) = \(\dfrac{11}{14}\)
( \(\dfrac{9}{2}\) - 2\(x\)) \(\times\) \(\dfrac{11}{7}\) = \(\dfrac{11}{14}\)
\(\dfrac{9}{2}\) - 2\(x\) = \(\dfrac{11}{14}\) : \(\dfrac{11}{7}\)
\(\dfrac{9}{2}\) - 2\(x\) = \(\dfrac{1}{2}\)
2\(x\) = \(\dfrac{9}{2}\) - \(\dfrac{1}{2}\)
2\(x\) = 4
\(x\) = 4 : 2
\(x\) = 2