bài1:
a)128-3(x+4)=23
b)[(4x+28).3+55]:5=35
c)(12-4^3).8^3=4.8^4
d)720:[41-(2x-5)]=2^3.5
e)2^x+2^x+1=48
f)(x-2)^2=(x-2)^4
Những câu hỏi liên quan
Bài 2. Tìm x biết:
a, 128 - 3(x + 4) = 23 d, 720 : [41 - (2x - 5)] = 2 3 .5
b, [(4x + 28).3 + 55] : 5 = 35 e, 123 – 5.( x + 4 ) = 38
c, (12x - 4 3 ).8 3 = 4.8 4 g, ( 3x – 2 4 ) .7 3 = 2.7 4
a,
128-3x-12=23
3x=128-12-23
3x=93
x=93:3
= 31
b,
(12x+84+55):5=35
12x+84+55=35.5
12x+84+55=175
12x=175-55-84
12x=36
x=36:12
x=3
tìm x
128 - 3 . ( x + 4 ) = 23
[ ( 4x +28 ) . 3 + 55 ] : 5 = 35
( 12x - 4^3 ) . 8^3 = 4.8^4
720 : [ 41 - ( 2x - 5 )] = 2^3 . 5
128-3.(x+4) =23
3.(x+4) =128-23
3.(x+4) = 105
x+4 =105:3
x+4 =35
x = 35-4
x=31
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1.tìm x
a,128-3.(x=4)=23 b,[(4x =28).3=55]:5=35
c,(12x-4^3).8^3=4.8^4 d,720 :[41-(2x-5)]=263.5
\(a,128-3.\left(x+4\right)=23\\ \Rightarrow3.\left(x+4\right)=105\\ \Rightarrow x+4=35\\ \Rightarrow x=31\\ b,\left[\left(4x+28\right).3+55\right]:5=35\\ \Rightarrow\left(4x+28\right).3+55=175\\ \Rightarrow4x+28.3=120\\ \Rightarrow4x+28=60\\ \Rightarrow4x=32\\ \Rightarrow x=8.\)
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c) \(\left(12x-4^3\right).8^3=4.8^4\)
\(12x-64=4.8^4:8^3\)
\(12x-64=32\)
\(12x=32+64\)
\(12x=96\)
\(x=\dfrac{96}{12}\)
\(x=8\)
d) \(720:\left[41-\left(2x-5\right)\right]:5=35\)
\(720:\left(41-2x+5\right):5=35\)
\(720:\left(46-2x\right)=35.5\)
\(720:\left(46-2x\right)=175\)
\(46-2x=720:175\)
\(46-2x=\dfrac{144}{35}\)
\(2x=46-\dfrac{144}{35}\)
\(2x=\dfrac{1466}{35}\)
\(x=\dfrac{1466}{35}:2\)
\(x=\dfrac{733}{35}\)
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128 - 3 ( x + 4 ) = 23
(4 × + 28 ) . 3 + 55 ) : 5 = 55
(12 x - 43 ) .83 = 4.84
720 : ( 41 - ( 2x - 5 ) = 23.5
Ai nhanh mình tick
128 - 3( x + 4 ) = 23
3( x + 4 ) = 105
x + 4 = 35
x = 31
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2x+23=37:34
[(4x+28).3+55]:5=35
17-(3x+9)=2-(-3+x)
(12x-43).83=4.84
720:[41-(2x-5)]=23.5
128-3.(x+4)=23
(1)\(2x+23=3^7\div3^4\)
\(2x+23=3^3\)
\(2.x=27-23=4\)
\(x=4\div2\)
\(x=2\)
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a, 128-3x(x+4)=23
b, [(4.x+23).3+55]
c, (12.x-4/3).8/3=4.8/4
d, 720:[41-(2.x-5)]
A [ {4X +28 } 3+ 55] :5=35 B {12 X -4 mủ 3} 8 MỦ 3=4.8 MỦ 4 C 720 :[ 41 -{2X -5} =2 MỦ 3.5
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Tìm x
[(4x+28).3+55]:5=35
(12x-43).83=4.84
720:[41-(2x-5)]=23.5
Tim x
b) [ ( 4x+ 28 ) .3 +55 ] : 5 = 35
c) (12x - 4^3 ) . 8^3 = 4.8^4
d) 720 : [ 41 - (2x -5 )] = 2^3 . 5
a) \(\left[\left(4x+28\right).3+55\right]:5=35\)
\(\Leftrightarrow\left(4x+28\right).3+55=35.5\)
\(\Leftrightarrow\left(4x+28\right).3+55=175\)
\(\Leftrightarrow\left(4x+28\right).3=175-55\)
\(\Leftrightarrow\left(4x+28\right).3=120\)
\(\Leftrightarrow4x+28=120:3\)
\(\Leftrightarrow4x+28=40\)
\(\Leftrightarrow4x=40-28\)
\(\Leftrightarrow4x=12\)
\(\Leftrightarrow x=12:4\)
\(\Leftrightarrow x=3\)
Vậy \(x=3\)
b) \(\left(12x-4^3\right).8^3=4.8^4\)
\(\Leftrightarrow12x-4^3=4.8^4:8^3\)
\(\Leftrightarrow12x-4^3=4.8^{4-3}\)
\(\Leftrightarrow12x-4^3=4.8\)
\(\Leftrightarrow12x-4^3=32\)
\(\Leftrightarrow12x-64=32\)
\(\Leftrightarrow12x=32+64\)
\(\Leftrightarrow12x=96\)
\(\Leftrightarrow x=96:12\)
\(\Leftrightarrow x=8\)
Vậy \(x=8\)
c) \(720:\left[41-\left(2x-5\right)\right]=2^3.5\)
\(\Leftrightarrow720:\left[41-\left(2x-5\right)\right]=8.5\)
\(\Leftrightarrow720:\left[41-\left(2x-5\right)\right]=40\)
\(\Leftrightarrow41-\left(2x-5\right)=720:40\)
\(\Leftrightarrow41-\left(2x-5\right)=18\)
\(\Leftrightarrow2x-5=41-18\)
\(\Leftrightarrow2x-5=23\)
\(\Leftrightarrow2x=23+5\)
\(\Leftrightarrow2x=28\)
\(\Leftrightarrow x=28:2\)
\(\Leftrightarrow x=14\)
Vậy \(x=14\)
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