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a) \(8x-40=56\)
\(\Leftrightarrow8x=96\)
\(\Rightarrow x=12\)
b) \(105-3x=60\)
\(\Leftrightarrow3x=45\)
\(\Rightarrow x=15\)
c) \(75883-\left(31200+x\right)=999\)
\(\Leftrightarrow31200+x=74884\)
\(\Rightarrow x=43684\)
d) \(19-9\left(x+1\right)=10\)
\(\Leftrightarrow9\left(x+1\right)=9\)
\(\Leftrightarrow x+1=1\)
\(\Rightarrow x=0\)
e) \(\left(17x-25\right)\div8+65=81\)
\(\Leftrightarrow\left(17x-25\right)\div8=16\)
\(\Leftrightarrow17x-25=128\)
\(\Leftrightarrow17x=153\)
\(\Rightarrow x=9\)
a) 8x - 40 = 56
8x = 56 - 40
8x = 16
x = 2
b) 105 - 3x = 60
3x = 105 - 60
3x = 45
x = 15
c) 75883 - ( 31200 + x ) = 999
75883 - 31200 - x = 999
44683 - x = 999
x = 44683 - 999
x = 43684
d) 19 - 9 ( x + 1 ) = 10
19 - 9x - 9 = 10
10 - 9x = 10
9x = 0
x = 0
e) ( 17x - 25 ) : 8 + 65 = 81
( 17x - 25 ) : 8 = 16
17x - 25 = 128
17x = 128 + 25
17x = 153
x = 9
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a, (-72).(15 - 49) + 15.(-56 + 72)
= -72 . 15 + 72.49 - 15.56 + 15.72
= (-72.15 + 15.72) + (72.49 - 15.56)
= 3528 - 84
= 2688
1b, 1532 + (-186) + (-1432) + (-14) + 123
= (1532 - 1432) - (186 + 14) + 123
= 100 - 200 + 123
= 223 - 200
= 23
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\(\Leftrightarrow x^2-2x+1-1=0\)
\(\Leftrightarrow\left(x-1\right)^2=1\Rightarrow\left(x-1\right)=\pm1\Rightarrow\left[{}\begin{matrix}x=0\\x=2\end{matrix}\right.\)
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a. ( 2x + 1 )2 = 49
<=> ( 2x + 1 )2 = 72
<=> 2x + 1 = 7
<=> x = 3
b. ( 2x - 1 )4 = 81
<=> ( 2x - 1 )4 = 34
<=> 2x - 1 = 3
<=> x = 2
c. ( x + 1 )3 = 2x3
<=> x + 1 = 2x
<=> x = 1
d. ( 2x + 1 )3 = 3x3
<=> 2x + 1 = 3x
<=> x = 1
( 2x + 1 )2 = 49
<=> ( 2x + 1 )2 = ( ±7 )2
<=> \(\orbr{\begin{cases}2x+1=7\\2x+1=-7\end{cases}}\Rightarrow\orbr{\begin{cases}x=3\\x=-4\end{cases}}\)
( 2x - 1 )4 = 81
<=> ( 2x - 1 )4 = ( ±3 )4
<=> \(\orbr{\begin{cases}2x-1=3\\2x-1=-3\end{cases}}\Rightarrow\orbr{\begin{cases}x=2\\x=-1\end{cases}}\)
( x + 1 )3 = ( 2x )3
<=> x + 1 = 2x
<=> x - 2x = -1
<=> -x = -1
<=> x = 1
( 2x + 1 )3 = ( 3x )3
<=> 2x + 1 = 3x
<=> 2x - 3x = -1
<=> -x = -1
<=> x = 1
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\(5^{x+1}+5^{x-1}=130\)
\(5^x\cdot5^1+5^x\div5^1=130\)
\(5^x\cdot5^1+5^x\cdot\dfrac{1}{5}=130\)
\(5^x\cdot\left(5+\dfrac{1}{5}\right)=130\)
\(5^x\cdot\dfrac{26}{5}=130\)
\(5^x=130\div\dfrac{26}{5}\)
\(5^x=130\cdot\dfrac{5}{26}\)
\(5^x=25\)
\(\Rightarrow5^x=5^2\)
\(\Rightarrow x=2\)
Mọi người còn câu trả lời nào khác không cứ trả lời đi mik tick cho
\(17x+81-72=910\)
\(\Leftrightarrow17x=910-81+72\)
\(\Leftrightarrow17x=901\)
\(\Leftrightarrow x=53\)
17x + 81 - 72 = 910
17x + 81 = 910 +72
17x + 81 =982
17x = 982 - 81
17x =901
x =901 : 17
x =53
kb nha!