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Tính lần lượt 2 vế ta được:
-5 < x< -0,4
=> x = -4, -3, -2, -1, 0
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a) Ta được: x . 1,25 = 5. (-2) nên \(x = \frac{{5.( - 2)}}{{1,25}} = - 8\)
Vậy x = -8
b) Vì 18 : x = 2,4 : 3,6 nên \(\frac{{18}}{x} = \frac{{2,4}}{{3,6}} \Rightarrow 18.3,6 = x.2,4 \Leftrightarrow x = \frac{{18.3,6}}{{2,4}} = 27\)
Vậy x = 27
c) Vì (x+1) : 0,4 = 0,5 : 0,2 nên \(\frac{{x + 1}}{{0,4}} = \frac{{0,5}}{{0,2}} \Rightarrow (x + 1).0,2 = 0,4.0,5 \Leftrightarrow x + 1 = \frac{{0,4.0,5}}{{0,2}} = 1 \Leftrightarrow x = 0\)
Vậy x = 0
a, x= (-2). 5 :1,25 = -8
b, x= 18 : (2,4:3,6)= 18: 2/3 = 18 x 3/2 = 27
c, x+1= (0,5:0,2) x 0,4= 2,5 x 0,4= 1
=> x=1-1=0
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\(\frac{1}{3}-\left(\frac{1}{3.4}-\frac{1}{4.5}-...-\frac{1}{7.8}\right)=x-\frac{5}{18}\)
\(x-\frac{5}{18}=\frac{1}{3}-\left(\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+...+\frac{1}{7}-\frac{1}{8}\right)\)
\(x-\frac{5}{18}=\frac{1}{3}-\frac{1}{3}+\frac{1}{8}\)
\(x-\frac{5}{18}=0+\frac{1}{8}\)
\(x-\frac{5}{18}=\frac{1}{8}\)
\(x=\frac{1}{8}+\frac{5}{18}\)
\(x=\frac{9}{72}+\frac{20}{72}\)
\(x=\frac{29}{72}\)
1/3 - 1/12 - 1/20 - 1/30 - 1/42 - 1/56 = x - 5/18
1/4 - 1/20 - 1/30 - 1/42 - 1/56 = x - 5/18
1/5 - 1/30 - 1/42 - 1/56 = x - 5/18
1/6 - 1/42 - 1/56 = x - 5/18
1/7 - 1/56 = x - 5/18
1/8 = x - 5/18
x=1/8+5/18
x= 29/72
Vậy : x = 29/72
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\(\frac{72-x}{3}=\frac{x-18}{5}\)
\(\Rightarrow\frac{\left(72-x\right).5}{15}=\frac{3\left(x-18\right)}{15}\)
\(\Rightarrow\left(72-x\right).5=3\left(x-18\right)\)
\(\Rightarrow360-5x=3x-54\)
\(\Rightarrow-3x-5x=-360-54\)
\(\Rightarrow-8x=-414\)
\(\Rightarrow x=51,75\)
+) Vì \(\frac{72-x}{3}=\frac{x-18}{5}\)
\(\Rightarrow5\left(72-x\right)=3\left(x-18\right)\)
\(5.72-5x=3x-3.18\)
\(360-5x=3x-54\)
\(-5x-3x=-54-360\)
\(-8x=-414\)
\(x=-414:\left(-8\right)\)
\(x=51,75\)
Vậy x = 51,75
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\(\left(-9\right).\left(-6\right)=5.|x-18|\)
\(54=5.|x-18|\)
\(|x-18|=\frac{54}{5}\)
\(=>\orbr{\begin{cases}x-18=-\frac{54}{5}\\x-18=\frac{54}{5}\end{cases}}\)
\(=>\orbr{\begin{cases}x=....\\x=...\end{cases}}\)
P/S: bn tự tính nha
\(ĐK:x\ne18\)
Ta có : \(\frac{-9}{|x-18|}=\frac{5}{-6}\Rightarrow\left(-9\right).\left(-6\right)=5.|x-18|\)
\(\Rightarrow5.|x-18|=54\)
\(\Rightarrow|x-18|=54:5=10,8\)
\(\Rightarrow\orbr{\begin{cases}x-18=10,8\\x-18=-10,8\end{cases}}\)
\(\Rightarrow\)\(\orbr{\begin{cases}x=10,8+18=28,8\\x=-10,8+18=7,2\end{cases}}\left(TMĐK\right)\)
Vậy x=28,8 hoặc x=7,2.
(Nhớ k nha!!!)
\(\frac{1}{5^{18}}=\frac{5^{18}}{5^x}\)
\(\Rightarrow5^x=5^{18}.5^{18}\)
\(\Rightarrow5^x=5^{36}\)
\(\Rightarrow x=36\)
Chúc bn học tốt
\(5^{18}=\frac{5^{18}}{5^x}\)
\(\Rightarrow5^{18}.5^x=5^{18}\)
\(\Rightarrow5^x=1\)
\(\Rightarrow5^x=5^0\)
\(\Rightarrow x=0\)
Vậy \(x=0\)
Tham khảo nhé~