Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a, \(231-\left(x-6\right)=1339:13\)
\(\Leftrightarrow231-\left(x-6\right)=103\)
\(\Leftrightarrow x-6=128\)
\(\Leftrightarrow x=134\)
Vậy .....
b, \(70-5\left(2x-3\right)=45\)
\(\Leftrightarrow5\left(2x-3\right)=25\)
\(\Leftrightarrow2x-3=5\)
\(\Leftrightarrow2x=8\)
\(\Leftrightarrow x=4\)
Vậy ....
c, \(156-\left(x+61\right)=82\)
\(\Leftrightarrow x+61=74\)
\(\Leftrightarrow x=13\)
Vậy ....
d, \(6\left(5x+35\right)=330\)
\(\Leftrightarrow5x+35=55\)
\(\Leftrightarrow5x=20\)
\(\Leftrightarrow x=4\)
Vậy ......
e, \(936-\left(4x+24\right)=72\)
\(\Leftrightarrow4x+24=864\)
\(\Leftrightarrow4x=840\)
\(\Leftrightarrow x=210\)
Vậy ...
231-(x-6)=1339:13
237-x=103
=>x=237-103=134
Vậy x=134
70-5(2x-3)=45
70-10x+15=45
=>-10x=45-15-70=-40
=>x=4
Vậy x=4
Các caau sau tương tự nhé bn
a) 70 - 5 ( 2x-3 ) = 45
5( 2x-3 ) = 25
2x - 3 = 25 : 5
2x - 3 = 5
2x = 8
x = 8 : 2
x = 4
b) 6 ( 5x + 35 ) = 330
5x + 35 = 330 : 6
5x + 35 = 55
5x = 55 - 35
5x = 20
x = 20 : 5
x = 4
c) 936 - ( 4x + 24 ) = 72
4x + 24 = 936 - 72
4x + 24 = 864
4x = 864 - 24
4x = 840
x = 840 : 4
x = 210
d) 5( 3x + 34 ) = 515
3x + 34 = 515 : 5
3x + 34 = 103
3x = 103 - 34
3x = 69
x = 69 : 3
x = 23
\(a,70-5\left(2x-3\right)=45\)
\(\Leftrightarrow10x-15=70-45\)
\(\Leftrightarrow10x=25+15\)
\(\Leftrightarrow x=\frac{40}{10}=4\)
Vậy x=4
\(b,6\left(5x+35\right)=330\)
\(\Leftrightarrow5x+35=55\)
\(\Leftrightarrow5x=20\)
\(\Leftrightarrow x=4\)
vậy x=4
\(c,936-\left(4x+24\right)=72\)
\(\Leftrightarrow4x+24=936-72\)
\(\Leftrightarrow4x=864-24\)
\(\Leftrightarrow x=840:4=210\)
Vậy x=210
\(d,5\left(3x+34\right)=515\)
\(\Leftrightarrow3x+34=515:5\)
\(\Leftrightarrow3x=103-34\)
\(\Leftrightarrow x=69:3=23\)
Vậy x=23
a) => x : 80 = 2
=> x = 160
b) => 200/15 : x = 3
=> x = 40/9
c) => 158 - x = 140
=> x = 18
d) => 231 - (x-6) = 103
=> x - 6 = 128
=> x = 134
a) 70 - 5.(2x-3)=45
5.(2x-3)=70-45
10x-15 =25
10x =25 +15
10x =40
x =40:10
x = 4
b)6.(5x+35) =330
5x +35 = 330 : 6
5x +35 =55
5x = 55-35
5x = 20
x = 20 : 5
x = 4
c)936-(4.x+24)=72
4x+24 =936 - 72
4x+24 =864
4x = 864 - 24
4x = 840
x = 840 :4
x = 210
d)(x+1)+(x+3)+(x+5)
x+1+x+3+x+5=30
(x+x+x)+(1+3+5) = 30
3x + 9 =30
3x = 30-9
3x =21
x = 21 : 3
x = 7
e)Vì số lượng x bằng số số hạng nên số lượng x là :
(100 - 2) : 2 + 1 = 50 (số x)
Tổng 2 +4+6+8+...+100 là :
(100+2) x 50 : 2 = 2550
Ta có :
50 x + 2550 = 2650
50x = 2650 -2550
50x = 100
x = 100 : 50
x = 2
Tick nghen !
a) 70 - 5 .(x -3 ) =45
5 . ( x - 3 ) = 70 - 45
5 . ( x - 3 ) = 25
x - 3 = 25 : 5
x - 3 = 5
x = 5 + 3
x = 8
b) 156 - ( x + 61 )+82
sai đề ( không có kết quả )
c) 10 +2 .x = 45 : 43
10 + 2 . x = 42 = 16
2 . x = 16 -10
2 . x = 6
x = 6 : 2
x = 3
d) [(10 - x ).2 +3 ];3 -2=13
[ ( 10 - x ) . 2 + 3 ] : 3 = 13 + 2
[ ( 10 - x ) . 2 + 3 ] : 3 = 15
[ ( 10 - x ) . 2 + 3 ] = 15 x 3
[ ( 10 - x ) . 2 + 3 ] = 45
( 10 - x ) . 2 = 45 - 3
( 10 - x ) . 2 = 42
10 - x = 42 : 2
10 - x = 21
x = 10 - 21
x = - 11
hok tốt
Vì 5x=5.x
nên 70-5x(x-3)=45
=>70-5.3.(x-3)=45
5.3.(x-3)=70-45
15.(x-3)=25
x-3=25:15
x-3=5/3
x = 5/3 +3
x = 14/3
k hộ nha đúng đó!
\(a,14-5+x=30\)
\(\Rightarrow9+x=30\Rightarrow x=30-9\)
\(\Rightarrow x=21\)
\(b,45-\left(3+x\right)=14\)
\(\Rightarrow3+x=45-14\)
\(\Rightarrow3+x=31\Rightarrow x=31-3\)
\(\Rightarrow x=28\)
\(c,18+\left(-3+x\right)-\left(44-x\right)=55\)
\(\Rightarrow18-3+x-44+x=55\)
\(\Rightarrow2x-29=55\Rightarrow2x=55+29\)
\(\Rightarrow2x=84\Rightarrow x=84:2\)
\(\Rightarrow x=42\)
\(d,\left(x-45\right).27=0\)
\(\Rightarrow x-45=0\Rightarrow x=45\)
a) \(70-5\left(2x-3\right)=45\)
\(70-10x+15=45\)
\(-10x=45-70-15\)
\(-10x=-40\)
\(x=4\)
vay \(x=4\)
b) \(156-\left(x+61\right)=82\)
\(x+61=156-82\)
\(x+61=74\)
\(x=74-61\)
\(x=13\)
vay \(x=13\)
c) \(6\left(5x+35\right)=330\)
\(30x+210=330\)
\(30x=330-210\)
\(30x=120\)
\(x=4\)
vay \(x=4\)
d) \(936-\left(4x+24\right)=72\)
\(4x+24=936-72\)
\(4x+24=864\)
\(4x=864-24\)
\(4x=840\)
\(x=210\)
vay \(x=210\)
\(70-5.\left(2x-3\right)\)\(=45\)
\(5.\left(2x-3\right)\)\(=\)\(70-45\)
\(5.\left(2x-3\right)\)\(=25\)
\(2x-3=25:5\)
\(2x-3=5\)
\(2x=8\)
\(x=8:2\)
\(x=4\)
\(156-\left(x+61\right)\)\(=82\)
\(x+61=156-82\)
\(x+61=74\)
\(x=74-61\)
\(x=13\)
\(6.\left(5x+35\right)\)\(=330\)
\(5x+35=330:6\)
\(5x+35=55\)
\(5x=55-35\)
\(5x=20\)
\(x=20:5\)
\(x=4\)
\(936-\left(4x+24\right)\)\(=72\)
\(4x+24=936-72\)
\(4x+24=864\)
\(4x=864-24\)
\(4x=840\)
\(x=840:4\)
\(x=210\)