Tìm số tự nhiên x biết:
231+(312-x)=531
(4x+5):3-121:11=4
làm đẩy đủ các bước giúp e với ạ
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a) 2115 : x = 21
=> x = 2115 : 21 = \(\frac{705}{7}\) ( sai đề )
b) \(\left(9\times x-21\right):3=2\)
=> \(\left(9\times x-21\right)=2\times3=6\)
=> \(9\times x=6+21=27\)
=> \(x=27:9=3\)
Vậy x = 3
c) 231 + ( 312 - x ) = 531
=> 231 + 312 - x = 531
=>. 543 - x = 531
=> x = 543 - 531 = 12
Vậy x = 12
a) 2115 : x = 21
x= 705/7
b) ( 9 * x - 21) : 3 = 2
9 * x - 21 = 6
9 * x = 27
x = 3
c) 231 + ( 312 - x) = 531
231 + 312 - x = 531
543 - x = 531
x =12
a) (x - 29) - 11 = 0
x - 29 = 0 + 11
x - 29 = 11
x = 29 + 11
x = 40
b) 231 + (321 - x) = 531
231 + 321 - x = 531
552 - x = 531
x = 552 - 531
x = 21
a) (x - 29) - 11 = 0
(x - 29) = 0 + 11
x - 29 = 11
x = 11 + 29
x = 40
b) 231 + (321 - x) = 531
(321 - x) = 531 - 231
321 - x = 300
x = 321 - 300
x = 21
c) (4 . x + 5) : 3 - 121 : 11 = 4
(4 . x + 5) : 3 - 11 = 4
(4 . x + 5) : 3 = 4 + 11
(4 . x + 5) : 3 = 15
(4 . x + 5) = 15 . 3
(4 . x + 5) = 45
4 . x + 5 = 45
4 . x = 45 - 5
4 . x = 40
x = 40 : 4
x = 10
d) 131 . x - 941 = 27 x 23
131 . x - 941 = 621
131 . x = 621 + 941
131 . x = 1562
x = 1562 : 131
x = 11.9236641221
Học tốt!!!
(4X+5) : 3 - 121 : 11 = 4
(4X+5) : 3 - 11 = 4
(4X+5) : 3 = 4 + 11 = 15
(4X+5) = 15 * 3 = 45
4X = 45 - 5 = 40
X = 40 : 4 = 10
Ta có: {4x+5}:3-121:11=4
{4x+5} :3- 11=4
{4x+5}:3=15
4x+5=45
4x=40
x=10
Vậy x=10.
( x - 29 ) - 11 = 0
x - 29 = 0 + 11
x - 29 = 11
x = 11 + 29
x = 40
231 + ( 312 - x ) = 531
312 - x = 531 - 231
312 - x = 300
x = 312 - 300
x = 12
a, (x - 29) - 11 = 0
(x - 29) = 0 + 11
x = 11 + 29 = 40
b, 231 + (321 - x) = 531
(321 - x) = 531 - 231
x = 321 - 300 = 21
c, (4 . x + 5) : 3 - 121 : 11 = 4
(4 . x + 5) : 3 - 11 = 4
(4 . x + 5) : 3 = 4 + 11
(4 . x + 5) = 15 : 3
4 . x = 5 - 5
x = 0 : 4 = 0
d, 131 . x - 941 = 27 . 23
131 . x - 941 = 210 = 1024
131 . x = 1024 + 941
x = 1965 : 131 = 15
\(\left(x+2\right)-2=0\)
\(\Rightarrow x+2-2=0\)
\(\Rightarrow x=0\)
\(\left(x+3\right)+1=7\)
\(\Rightarrow x+3+1=7\)
\(\Rightarrow x+4=7\)
\(\Rightarrow x=3\)
\(\left(3x-4\right)+4=12\)
\(\Rightarrow3x-4+4=12\)
\(\Rightarrow3x=12\)
\(\Rightarrow x=4\)
\(\left(5x+4\right)-1=13\)
\(\Rightarrow5x+4-1=13\)
\(\Rightarrow5x+3=13\)
\(\Rightarrow5x=10\)
\(\Rightarrow x=2\)
\(\left(4x-8\right)-3=5\)
\(\Rightarrow4x-8-3=5\)
\(\Rightarrow4x-11=5\)
\(\Rightarrow4x=16\)
\(\Rightarrow x=4\)
\(8-\left(2x+4\right)=2\)
\(\Rightarrow8-2x-4=2\)
\(\Rightarrow4-2x=2\)
\(\Rightarrow2x=2\)
\(\Rightarrow x=1\)
\(7+\left(5x+2\right)=14\)
\(\Rightarrow7+5x+2=14\)
\(\Rightarrow9+5x=14\)
\(\Rightarrow5x=5\)
\(\Rightarrow x=1\)
\(5-\left(3x-11\right)=1\)
\(\Rightarrow5-3x+11=1\)
\(\Rightarrow16-3x=1\)
\(\Rightarrow3x=15\)
\(\Rightarrow x=5\)
a: =>312-x=300
hay x=12
231+(312-x)=531
<=> 312 - x = 531 - 231
<=> 312 - x = 300
<=> - x = 300 - 312
<=> - x = - 12
<=> x = 12