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X x 4 + x = 55 .35
X x ( 4 + 1 ) = 55 x 35
X x 5 = 55 x 35
X = 55 x 35 : 5
X = 55 x 7
X = 385
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X * 1999 - x = 1999 x 1997 + 1999
X * 1998 = 1999 x 1998
=> x = 1999
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9,15.x+2,85.x=10
=>x(9,15+2,85)=10
=> x.12=10
=>x=5/6
(đấu nhân là "." nha )
tick nha
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( x - 25) x 17 = 34
=> x - 25 = 34 : 17
x - 25 = 2
=> x = 2 + 25
x = 27
145 + (150 - x) = 250
=> 150 - x = 250 - 145
150 - x = 105
=> x = 150 - 105
x = 45
(2x - 7) x 81 = 0
=> 2x - 7 = 0 : 81
2x - 7 = 0
=> 2x = 7
=> x = 7 : 2 = 3,5
x - 90 : 15 = 32
=> x - 6 = 32
=> x = 32 + 6
x = 38
520 - (x - 5) = 250 : 5
=> 520 - (x - 5) = 50
=> x - 5 = 520 - 50
x - 5 = 470
=> x = 470 + 5
x = 475
t i c k nhé!! 346457567684786896789
a ) \(\left(x-5\right).17=34\)
=> \(x-5=2\)
=> \(x=7\)
b ) \(145+\left(150-x\right)=250\)
=> \(150-x=105\)
=> \(x=150-105\)
=> \(x=45\)
c ) \(\left(2.x-7\right).81=0\)
=> \(2x-7=0\)
=> \(2x=7\)
=> \(x=\frac{7}{2}\)
d ) \(x-90:15=32\)
=> \(x-6=32\)
=> \(x=38\)
Mấy cái dấu chấm đó là nhân đó nhé
x.(9,25+75%)=55,35
x.(9,25+3/4)=55,35
x.(9,25+3/4)=1925
x.40/4=1925
x.10/1=1925
x=1925:10/1
x=192,5