( 12x-43).83=4.84
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a) x-(-25+x)=13-x
⇒ x+25-x=13-x
⇒ 13-x=25
⇒ x= -12
b) 15-(30+x)=x-(27-l-8l)
⇒ 15-30-x=x-(27-8)
⇒ -15-x=x-19
⇒ -x-x=-19+15
⇒ -2x+4=0
⇒ -2x=-4
⇒ x=2
c) (12x-43).83=4.84
⇒ 12x.83-43.83=4.84
⇒ 6144x-32768=16384
⇒ 6144x=49152
⇒ x=8
a: Ta có: \(x-\left(-25+x\right)=13-x\)
\(\Leftrightarrow13-x=25\)
hay x=-12
b: Ta có: \(15-\left(30+x\right)=x-\left(27-\left|-8\right|\right)\)
\(\Leftrightarrow-15-x=x-19\)
\(\Leftrightarrow-2x=-4\)
hay x=2
c: Ta có: \(\left(12x-4^3\right)\cdot8^3=4\cdot8^4\)
\(\Leftrightarrow\left(12x-64\right)\cdot512=16384\)
\(\Leftrightarrow12x-64=32\)
hay x=8
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a: =>12x-64=32
=>12x=96
=>x=8
b: =>x-1=5
=>x=6
c: =>2^x*3=96
=>2^x=32
=>x=5
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a, 128 – 3(x+4) = 23
b, 12 x - 4 3 . 8 3 = 4 . 8 4
c, [(4x+28).3+55]:5 = 35
d, 720:[41 – (2x – 5)] = 2 3 . 5
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1. \(\left(387-41\right)-\left(81+13\right)\)
\(=346-94=252\)
2. \(\left(83+81\right)-\left(81+13\right)\)
\(=83+81-81-13\)
\(=70\)
3. \(281-\left(-37\right)+83-181\)
\(=281-181+37+83\)
\(=100+120=220\)
4. \(87-\left(-13\right)+\left(-21\right)-79\)
\(=87+13-21-79\)
\(=100-100=0\)
5. \(\left(-172\right)+\left(-43\right)+72-57\)
\(=-172+72-43-57\)
\(=-100-100=-200\)
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a ) 27 3 − − 8 5 − 125 3 = 33 3 − ( − 2 ) 3 3 − 53 3 = 3 − ( − 2 ) − 5 = 3 + 2 − 5 = 0 b ) 135 3 5 3 − 54 3 ⋅ 4 3 = 135 5 3 − 54.4 3 = 27 3 − 216 3 = 33 3 − 63 3 = 3 − 6 = − 3
\(\left(12x-4^3\right)\cdot8^3=4\cdot8^4\)
\(12x-4^3=\frac{2^2\cdot2^{12}}{2^9}\)
\(4\left(3x-16\right)=2^5\)
\(3x-16=8\)
\(x=8\)