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a, ( x - 35) . 16 =0
x - 35 = 0 : 16=0
x = 0 + 35
x = 35
b,19. (x - 7) = 19
x - 7=19 : 19=1
x =1 + 7
x =8
c,37.x + 63.x = 200
(37 + 63)x = 200
100.x=200
x =200 : 100
x = 2
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h)\(\left(2x-1\right)\left(x-7\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}2x-1=0\\x-7=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=\frac{1}{2}\\x=7\end{cases}}\)
g) \(x^2+2x=0\)
\(\Leftrightarrow x\left(x+2\right)=0\)
\(\Leftrightarrow\orbr{\begin{cases}x=0\\x+2=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=0\\x=-2\end{cases}}\)
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7x-x=5^21:5^19+3.2^2-7^0
x.(7-1)=5^2+3.4-1
x.6=25+12-1
x.6=36
x=36:6
x=6
vậy x=6
k mk nha
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a, 5x - 1 = 13
=> 5x = 14
=> x = 14/5
b,(x - 2) = 0
=> x - 2 = 0
=> x = 2
c, 5(x - 7) + 8 = 0
=>5(x - 7) = -8
=>x -7 = -8/5 = -1,6
=>x = 5,4
d, (x - 19).4 = 36
=>x - 19 = 9
=>x = 28
e, 3(x - 7) - 2 = 4
=> 3(x - 7) = 6
=> x - 7 = 2
=> x = 9
=> 7-x=0 hoặc x+19=0
x=7-0 x=0-19
x=7 x=(-19)
=>x=7 ; -19
Ta có: (7 - x) . (x + 19) = 0
=> 7 - x = 0
hoặc x + 19 = 0
* Nếu 7 - x = 0 => x = 0 + 7 = 7
* Nếu x + 19 = 0 => x = 0 - 19 = -19
Vậy x = 7;-19.