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4.\(x\) + 2.[3.\(x\) - 11] = 134
4.\(x\) + 6.\(x\) - 22 = 134
10\(x\) = 134 + 22
10\(x\) = 156
\(x\) = 156 : 10
\(x\) = 15,6
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a: =>7(135:x-13)=14
=>135:x-13=2
=>135:x=15
=>x=9
b: =>11x-66-4x=11
=>7x=77
=>x=11
\(120+\left(135:x-13\right)\cdot7=134\)
\(\Rightarrow\left(135:x-13\right)\cdot7=134-120\)
\(\Rightarrow\left(135:x-13\right)\cdot7=14\)
\(\Rightarrow135:x-13=14:7\)
\(\Rightarrow135:x=2+13\)
\(\Rightarrow135:x=15\)
\(\Rightarrow x=135:15\)
\(\Rightarrow x=9\)
_______________
\(11\cdot\left(x-6\right)=4\cdot x+11\)
\(\Rightarrow11\cdot x-66=4\cdot x+11\)
\(\Rightarrow11\cdot x-4\cdot x=11+66\)
\(\Rightarrow7\cdot x=77\)
\(\Rightarrow x=77:7\)
\(\Rightarrow x=11\)
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a) y . 134 - y . 24 - y . 10 = 710 000
\(\Rightarrow\) y . ( 134 - 24 - 10 ) = 710 000
\(\Rightarrow\) y . 100 = 710 000
y = 710 000 : 100
y = 71 000
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\(a,x-\dfrac{1}{4}=\dfrac{7}{2}.\dfrac{-3}{5}\\ \Rightarrow x-\dfrac{1}{4}=\dfrac{-21}{10}\\ \Rightarrow x=\dfrac{-21}{10}+\dfrac{1}{4}\\ \Rightarrow x=\dfrac{-37}{20}\\ b,\dfrac{x}{134}=\dfrac{9}{7}.\dfrac{5}{-11}\\ \Rightarrow\dfrac{x}{134}=\dfrac{-45}{77}\\ \Rightarrow x=\dfrac{-45}{77}.134\\ \Rightarrow x=\dfrac{-6030}{77}\)
\(x-\dfrac{1}{4}=\dfrac{7}{2}\cdot\dfrac{-3}{5}\)
\(x-\dfrac{1}{4}=\dfrac{-21}{10}\)
\(x=\dfrac{-21}{10}+\dfrac{1}{4}\)
\(x=\dfrac{-37}{20}\)
b ) \(\dfrac{x}{134}=\dfrac{9}{7}\cdot\dfrac{5}{-11}\)
\(\dfrac{x}{134}=\dfrac{9}{7}\cdot\dfrac{-5}{11}\)
\(\dfrac{x}{134}=\dfrac{-45}{77}\)
\(x=\dfrac{-45}{77}\cdot134\)
\(x=-\dfrac{6034}{77}\)
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\(\frac{x}{134}=\frac{9}{7}\cdot\frac{5}{-11}\)
\(\frac{x}{134}=\frac{9\cdot\left(-5\right)}{7\cdot11}\)
\(\frac{x}{134}=\frac{-45}{77}\)
a, ( -2009 ) - ( 234 - 2009 )
b, ( 134 - 167 + 45 ) - ( 134 + 45 )
c, 321 + { -15 + [ 30 + ( -321 ) ]}
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a)
2x - 138 = 23 . 32
2x - 138 = 8 . 9
2x - 138 = 72
2x = 72 + 138
2x = 110
x = 110 : 2
x = 55
còn lại tương tự
x = -15
134-4.(11-x)=30
=>4.(11-x)=134-30
=>4.(11-x)=104
=>11-x=104:4
=>11-x=26
=>x=11-26
=>x= -15