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\(2.x+2^2.x-10=5^2+3^2\)
\(\Leftrightarrow2.x+4.x-10=25+9\)
\(\Leftrightarrow2.x+4.x-10=34\)
\(\Leftrightarrow x.\left(4+2\right)-10=34\)
\(\Rightarrow x.\left(4+2\right)=34+10=44\)
\(\Rightarrow x=44:6=7\)(dư 2)
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a :
[( 10 - x ) . 2 + 5] : 3 - 2 = 3
( 10 - x ) x 2 + 5 = ( 3+2) x 3
( 10 - x ) x 2 + 5 = 15
10 -x = ( 15 -5 ) : 2
10 - x = 5
x = 5
a) \(\left[\left(10-x\right)2+5\right]:3-2=3\)
\(\left(20-2x+5\right):3-2=3\)
\(\left(20-2x+5\right):3=5\)
\(20-2x+5=15\)
\(20-2x=10\)
\(2x=10\)
\(x=5\)
b) \(6x-302=2^3\cdot5\)
\(6x=8\cdot5+302\)
\(6x=342\)
\(x=57\)
c) \(12\left(x-1\right):3=4^3-2^3\)
\(12\left(x-1\right):3=56\)
\(12\left(x-1\right)=168\)
\(x-1=12\)
\(x=13\)
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* (-6 - 2) . (-6 + 2)
= -8 . -4
= 32
*(7 . 3 - 3) : (-6)
= 18 : (-6)
= -3
k cho mik nhe
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\(\dfrac{25}{2-x}=\dfrac{5}{3}\\ \Rightarrow25.3=5.\left(2-x\right)\\ \Rightarrow75=10-5x\\ \Rightarrow-5x=-65\\ \Rightarrow13\)
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a: \(\Leftrightarrow5x=20\)
hay x=4
b: \(\Leftrightarrow x+7=24\)
hay x=17
1) \(5x-7=13\Rightarrow5x=13+7=20\Rightarrow x=20:5=4\)
2) \(\Rightarrow3\left(x+7\right)=95-23=72\)
\(\Rightarrow x+7=72:3=24\Rightarrow x=24-7=17\)
3) \(\Rightarrow2x+27=343\Rightarrow2x=343-27=316\Rightarrow x=316:2=158\)
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a, \(\left(1+5+5^2+5^3+......+5^{10}\right)xX=5+5^2+5^3+......+5^{11}\)
Vì 5 gấp 5 lần 1; 52 gấp 5 lần 5 ;...... nên X = 5
Cách làm thì tách ra nhé
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1)\(2^3\cdot37-2^3\cdot63-10=2^3\left(37-63\right)-10=8\cdot-26-10\)=-218
2)\(2^3+2^2+2^4=2^2\left(1+2+4\right)=4\cdot7=28\)
3)\(5^3-5=5\left(5^2-1\right)=5\cdot24=120\)
4)\(3+3^2+3^4=3\left(1+3+3^3\right)=3\cdot13=39\)
5)\(x^{n+1}-x^n=x^n\left(x-1\right)\)
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70 - 5 . ( 2.x - 3 ) = 45
5( 2x -3 ) = 70 - 45
5( 2x-3 ) = 25
2x-3 = 5
2x = 8
x = 4
`x:(-5/3) -(-2/5) =3/10`
`=> x: (-5/3) + 2/5 =3/10`
`=> x:(-5/3) = 3/10-2/5`
`=>x:(-5/3)= 3/10 - 4/10`
`=> x:(-5/3) = -1/10`
`=> x= -1/10 * (-5/3)`
`=> x= 5/30`
`=>x= 1/6`
Vậy `x=1/6`