152 - 2 . (x + 1) = 80
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a, => x= -9. 2
=> x= -18
b, => x= 12. (-4)
=> x=-48
c, => 152-(3x-1)=54
=> (3x-1)= 152- 54= 98
=> 3x= 98+1= 99
=> x = 99:3
=> x = 33
a) -152 - (3x + 1) = (-2).(-3)3
-152 - 3x - 1 = (-2).(-27)
-3x - 153 = 54
-3x = 54 + 153
-3x = 207
x = -69
b) x - 43 = (35 - x) - 48
x - 43 = 35 - x - 48
x - 43= -x - 13
x = -x - 13 + 43
x = 30 + x
x + x = 30
2x = 30
x = 15
1) \(152\times9+152\times1=152\times\left(9+1\right)=152\times10=1520\)
2) \(24\times999+24\times1=24\times\left(999+1\right)=24\times1000=24000\)
1/ 152 x 9 + 152 x 1 = 152 x ( 9 + 1 ) = 152 x 10 = 1520
2/ 24 x 999 + 24 x 1 = 24 x ( 999 + 1 ) = 24 x 1000 = 24000
\(2^{x+2}+2^{x-1}+2^{x-2}=152\)
=> \(2^x.2^2+2^x:2+2^x:2^2=152\)
=> \(2^x.2^2+2^x.\frac{1}{2}+2^x.\frac{1}{4}=152\)
=> \(2^x.(4+\frac{1}{2}+\frac{1}{4})=152\)
=> \(2^x.\frac{19}{4}=152\)
=> \(2^x=32\)
=> \(2^x=2^5\)
=> x = 5
1) \(\left(5x-1\right)\left(5x+1\right)=25x^2-7x+15\)
\(\Leftrightarrow25x^2-1=25x^2-7x+15\)
\(\Leftrightarrow7x=16\Leftrightarrow x=\dfrac{16}{7}\)
2) \(\left(3x-5\right)\left(x+1\right)-\left(3x-1\right)\left(x+1\right)=x-4\)
\(\Leftrightarrow3x^2-2x-5-3x^2-2x+1=x-4\)
\(\Leftrightarrow5x=0\Leftrightarrow x=0\)
\(152-2.\left(x+1\right)=80\)
\(2.\left(x+1\right)=72\)
\(x+1=36\)
\(x=35\)
\(152-2\left(x+1\right)=80\\ 2\left(x+1\right)=152-80\\ 2\left(x+1\right)=72\\ x+1=72:2\\ x+1=36\\ x=36-1\\ x=35\)