Tìm x biết [(4x+28)*3+35]:5=35
Tìm số tự nhiên x biết:
a, 128 – 3(x+4) = 23
b, 12 x - 4 3 . 8 3 = 4 . 8 4
c, [(4x+28).3+55]:5 = 35
d, 720:[41 – (2x – 5)] = 2 3 . 5
a, 128 – 3(x+4) = 23
b, 12 x - 4 3 . 8 3 = 4 . 8 4
c, [(4x+28).3+55]:5 = 35
d, 720:[41 – (2x – 5)] = 2 3 . 5
tìm x biết a, 128 - 3 x ( x + 4 ) = 13 ; b , ( 12x - 4 ^ 3 ) x 8 ^3 = 4 x 8 ^ 4 ; c, [ ( 4x + 28 ) x 23 + 55 ] : 5 = 35
tìm x biết a, 128 - 3 x ( x + 4 ) = 13 ; b , ( 12x - 4 ^ 3 ) x 8 ^3 = 4 x 8 ^ 4 ; c, [ ( 4x + 28 ) x 23 + 55 ] : 5 = 35
a: =>3(x+4)=115
=>x+4=115/3
hay x=103/3
b: =>\(8^3\cdot\left(12x-64\right)=4\cdot8^4\)
\(\Leftrightarrow12x-64=32\)
=>12x=96
hay x=8
c: \(\Leftrightarrow\left(4x+28\right)\cdot23+55=175\)
=>(4x+28)x23=120
=>4x+28=120/23
=>4x=-524/23
hay x=-131/23
Tìm số tự nhiên x, biết:
a, 128 – 3( x + 4 ) = 23
b, [( 4x + 28 ).3 + 55] : 5 = 35
a) \(128-3\left(x+4\right)=23\)
\(\Rightarrow3\left(x+4\right)=128-23\)
\(\Rightarrow3\left(x+4\right)=105\)
\(\Rightarrow x+4=35\)
\(\Rightarrow x=35-4\)
\(\Rightarrow x=31\)
b) \(\left[\left(4x+28\right)\cdot3+55\right]:5=35\)
\(\Rightarrow\left(4x+28\right)\cdot3+55=35\cdot5\)
\(\Rightarrow\left(4x+28\right)\cdot3+55=175\)
\(\Rightarrow\left(4x+28\right)\cdot3=120\)
\(\Rightarrow4x+28=40\)
\(\Rightarrow4x=12\)
\(\Rightarrow x=3\)
a, \(128-3\left(x+4\right)=23\)
\(=>3\left(x+4\right)=128-23\)
\(=>3\left(x+4\right)=105\)
\(=>x+4=105:3\)
\(=>x+4=35\)
\(=>x=35-4\)
\(=>x=31\)
b, \(\left[\left(4x+28\right).3+55\right]:5=35\)
\(=>\left(4x+28\right).3+55=35.5\)
\(=>\left(4x+28\right).3+55=175\)
\(=>\left(4x+28\right).3=175-55\)
\(=>\left(4x+28\right).3=120\)
\(=>4x+28=120:3\)
\(=>4x+28=40\)
\(=>4x=40-28\)
\(=>4x=12\)
\(=>x=12:4\)
\(=>x=3\)
\(#WendyDang\)
a) 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
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
\(a,128-3.\left(x+4\right)=23\\ \Rightarrow3.\left(x+4\right)=105\\ \Rightarrow x+4=35\\ \Rightarrow x=31\\ b,\left[\left(4x+28\right).3+55\right]:5=35\\ \Rightarrow\left(4x+28\right).3+55=175\\ \Rightarrow4x+28.3=120\\ \Rightarrow4x+28=60\\ \Rightarrow4x=32\\ \Rightarrow x=8.\)
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) \(720:\left[41-\left(2x-5\right)\right]:5=35\)
\(720:\left(41-2x+5\right):5=35\)
\(720:\left(46-2x\right)=35.5\)
\(720:\left(46-2x\right)=175\)
\(46-2x=720:175\)
\(46-2x=\dfrac{144}{35}\)
\(2x=46-\dfrac{144}{35}\)
\(2x=\dfrac{1466}{35}\)
\(x=\dfrac{1466}{35}:2\)
\(x=\dfrac{733}{35}\)
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 , biết :
[ ( 4 * X +28 ) * 3 + 55 ] : 5 =35
{ ( 4 . x + 28 ) . 3 + 55 } = 35 . 5
{ ( 4 . x + 28 ) . 3 + 55 } = 175
{ ( 4 . x + 28 ) . 3 } = 175 - 55
{ ( 4 . x + 28 ) . 3 } = 120
{ ( 4 . x + 28 ) } = 120 : 3
4 . x + 28 = 40
4 . x = 40 - 28
4 . x = 12
x = 12 : 4
x = 3
dương bạn lớp mấy ở đâu học trường nào
\(\left[\left(4x+28\right)\cdot3+55\right]:5=35\)
\(\Leftrightarrow\left(4x+28\right)\cdot3+55=35\cdot5\)
\(\Leftrightarrow\left(4x+28\right)\cdot3+55=175\)
\(\Leftrightarrow\left(4x+28\right)\cdot3=175-55\)
\(\Leftrightarrow\left(4x+28\right)\cdot3=120\)
\(\Leftrightarrow4x+28=120:3\)
\(\Leftrightarrow4x+28=40\)
\(\Leftrightarrow4x=40-28\)
\(\Leftrightarrow4x=12\)
\(\Leftrightarrow x=12:4\)
\(\Leftrightarrow x=3\)
Tìm x là số tự nhiên:
a, (x-6)^2=9
b,720:[41- (2x-5)]=2^3.5
c, [(4x+28).3+55] :5=35
a, vì : 32 = 9
=> x - 6 = 3
=> x = 9
b, 720 : [ 41 - ( 2x - 5 ) ] = 40
41 - ( 2x - 5 ) = 720 : 40 = 18
2x - 5 = 41 - 18 = 23
2x = 23 + 5 = 28
x = 28 : 2 = 14
c, ( 4x + 28 ) . 3 + 55 = 35 . 5 = 175
( 4x + 28 ) . 3 = 175 - 55 = 120
4x + 28 = 120 : 3 = 40
4x = 40 - 28 = 12
x = 12 : 4 = 3
**** GIÙM MK NHA , TKS
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