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\(\left[\left(4x+28\right).3+55\right]:5=35\)
\(\Rightarrow\left(4x+28\right).3+55=35.5\)
\(\Rightarrow\left(4x+28\right).3+55=175\)
\(\Rightarrow\left(4x+28\right).3=175-55\)
\(\Rightarrow\left(4x+28\right).3=120\)
\(\Rightarrow4x+28=120:3\)
\(\Rightarrow4x+28=40\)
\(\Rightarrow4x=40-28\)
\(\Rightarrow4x=12\)
\(\Rightarrow x=12:4\)
\(\Rightarrow x=3\)
[ ( 4x + 28 ). 3 + 55 ] ÷ 5 = 35
( 4x + 28 ). 3 + 55 = 35.5
( 4x + 28 ). 3 + 55 = 175
( 4x + 28 ). 3 = 175 - 55
( 4x + 28 ). 3 = 120
4x + 28 = 120 : 3
4x + 28 = 40
4x = 40 - 28
4x = 12
x = 12 : 4
x = 3
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
\(a.128-3\left(x+4\right)=23.\)
\(3\left(x+4\right)=128-23\)
\(3\left(x+4\right)=105\)
\(x+4=105:3=35\)
\(x=35-4=31\)
\(b.\left[\left(4x+28\right)\cdot3+55\right]:5=35\)
\(\left(4x+28\right)\cdot3+55=35\cdot5=175\)
\(\left(4x+28\right)\cdot3=175-55=120\)
\(4x+28=120:3=40\)
\(4x=40-28=12\)
\(x=12:4=3\)
[ ( 4X + 28 ) x 3 + 55 ] : 5 = 35
=> ( 4X + 28 ) x 3 + 55 = 175
=> ( 4X + 28 ) x 3 = 120
=> 4X + 28 = 40
=> 4X = 12
=> X = 12 : 4
=> X = 3
[(4x + 28).3 + 55] : 5 = 35
=> (4x + 28).3 + 55 = 175
=> (4x + 28).3 = 120
=> 4x + 28 = 40
=> 4x = 12
=> x = 3
vậy_
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
[(4x+28).3+55]:5=35
[(4x+28).3+55]=35.5
[(4x+28).3+55]=175
(4x+28).3=175-55
(4x+28).3=120
4x+28=120:3
4x+28=40
4x=40-28
4x=12
x=12:4
x=3
k cho mik nhoa bn nha!