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7x + 135 : 45 = 52
7x + 3 = 52
7x = 52 - 3
7x = 49
7x = 72
Vậy x = 2
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2.34 + 23.5 - 7.(52 - 5)
2.81 + 8.5 - 7.(25 -5)
= 162 + 40 - 140
= 162 - 100
= 62
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\(\dfrac{7}{78}:x=\dfrac{35}{52}\)
\(x=\dfrac{7}{78}:\dfrac{35}{52}\)
\(x=\dfrac{7}{78}.\dfrac{52}{35}\)
\(x=\dfrac{2}{15}\)
\(\dfrac{7}{78}=\dfrac{35}{52}x\)
\(x=\dfrac{7.52}{78.35}\)
\(x=\dfrac{2}{15}\)
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\(\dfrac{93}{17}:x+\left[\dfrac{-4}{17}\right]:x+\dfrac{22}{7}:\dfrac{52}{3}=\dfrac{4}{11}\)
\(=>\left(\dfrac{93}{17}+\dfrac{-4}{17}\right):x+\dfrac{11}{26}=\dfrac{4}{11}\)
\(=>\dfrac{89}{17}:x+\dfrac{11}{26}=\dfrac{4}{11}\)
\(=>\dfrac{89}{17}:x=\dfrac{4}{11}-\dfrac{11}{26}\)
\(=>\dfrac{89}{17}:x=\dfrac{-17}{286}\)
\(=>x=\dfrac{89}{17}:\dfrac{-17}{286}\)
\(=>x=\dfrac{-25454}{289}=-88\dfrac{22}{289}\)
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a: x-56:4=16
nên x-14=16
hay x=30
b: \(101+\left(36-4x\right)=105\)
\(\Leftrightarrow36-4x=4\)
hay x=8
Vì a: x-56:4=16
=>x-14=16
Hay:x=30
Vì b: 101+(36−4x)=105101+(36−4x)=105
⇔36−4x=4⇔36−4x=4
Hay:x=8
Vậy x={30:8}
Nếu sai thì thui nhá,đừng chửi mình!
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bài làm
2 - ( | x | + 7 ) = -52
<=> | x | + 7 = 2 + 52
<=> | x | + 7 = 54
<=> | x | = 54 - 7 = 47
<=> x = 47 hoặc x = -47.
Vậy....
2-(|x|+7)=-52
|x|+7=2+52
|x|+7=54
|x|=54-7
|x|=47
\(\orbr{\begin{cases}x=47\\x=-47\end{cases}}\)
Vậy x=47;x=-47
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`#3107.101107`
a,
`2x + 3x = 5^7 \div 5^5`
$\Rightarrow (2 + 3)x = 5^{7 - 5}$
$\Rightarrow 5x = 5^2$
$\Rightarrow 5x = 25$
$\Rightarrow x = 25 \div 5$
$\Rightarrow x = 5$
Vậy, `x = 5`
b,
`5(7x - 45) = 2^3 . 5^2 - 3^2 . 20`
`\Rightarrow 5(7x - 45) = 8.25 - 9.20`
`\Rightarrow 5(7x - 45) = 40.5 - 36.5`
`\Rightarrow 5(7x - 45) = 5.(40 - 36)`
`\Rightarrow 5(7x - 45) = 5.4`
`\Rightarrow 7x - 45 = 4`
`\Rightarrow 7x = 49`
`\Rightarrow x = 49 \div 7`
`\Rightarrow x = 7`
Vậy, `x = 7.`
A) (2+3).x=5 mũ 2
5.x=5 mũ 2
5.x=25
x=25:5
x=5
vậy x=5
câu B ko bt làm bn ạ
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\(52-4.\left(5.5^x+7\right)=4\)
\(\Rightarrow4.\left(5.5^x+7\right)=48\)
\(\Rightarrow5.5^x+7=12\)
\(\Rightarrow5.5^x=5\)
\(\Rightarrow5^x=1\)
\(\Rightarrow x=0\)
\(3^{x+3}-2.3^x=5^2.81\)
\(\Rightarrow3^x.27-2.3^x=2025\)
\(\Rightarrow3^x.\left(27-2\right)=2025\)
\(\Rightarrow3^x.25=2025\)
\(\Rightarrow3^x=81\)
\(\Rightarrow3^x=3^4\)
\(\Rightarrow x=4\)