106-(x+7)=9 45-(x+10)=31
156-(x+61)=82 126-(x+32)=86
a, 45 x 76 + 90 x 12
b, 2 x 31 x 12 + 4x6 x 69
c, 36 x 28 + 36 x 82 + 64 x 69 + 64 x 41
d, 156 ( x + 61 ) = 82
a) 45 x 76 + 90 x 12
= 45 x 76 + 45 x 2 x 12
= 45 x 76 + 45 x 24
= 45 x ( 76 + 24 )
= 45 x 100
= 4500
b) 2 x 31 x 12 + 4 x 6 x 69
= 24 x 31 + 24 x 69
= 24 x ( 31 + 69 )
= 24 x 100
= 2400
c) 36 x 28 + 36 x 82 + 64 x 69 + 64 x41
= 36 x ( 28 + 82 ) + 64 x ( 69 + 41 )
= 36 x 110 + 64 x 110
= 110 x ( 36 + 64 )
= 110 x 100
= 11 000
d) 156 ( x + 61) = 82
=> x + 61 = \(\frac{82}{156}\)
=> x + 61 = \(\frac{41}{78}\)
=> x = \(\frac{41}{78}\)- 61
=> x = \(\frac{-4717}{78}\)
45 x 76 + 90 x 12 = 45 x 76 + 45 x 2 x 12
= 45 x 76 + 45 x 24
= 45 x (76 + 24)
= 45 x 100
= 4500
b) 2 x 31 x 12 + 4 x 6 x 69 = 62 x 12 + 2 x 12 x 69
= 62 x 12 + 138 x 12
= (62 + 138) x 12
= 200 x 12 = 2400
a, 45 x 76 + 90 x 12
= ( 45 x 12 ) + ( 76 x 90 )
= 540 + 6840
= 7 380
c,
= 36 x ( 28 + 82 ) + 64 x ( 69 + 41 )
= 36 x 110 + 64 x 110
= 110 x ( 36 + 64 )
= 110 x 100
= 11000
a) 70 - 5 .(x -3 ) =45
b) 156 - ( x + 61 )+82
c) 10 +2 .x = 4 mũ 5 : 4 mũ 3
d) [(10 - x ).2 +3 ];3 -2=13
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
\(70-5\left(x-3\right)=45\)
\(5\left(x-3\right)=70-45\)
\(5\left(x-3\right)=25\)
\(x-3=\frac{25}{5}=5\)
\(x=5+3\)
\(x=8\)
\(10+2x=\frac{4^5}{4^3}\)
\(10+2x=4^2=16\)
\(2x=16-10\)
\(2x=6\)
\(x=\frac{6}{2}=3\)
a) 156-(x+61)=82 b) (x-35)-120=0 c) 124-(x-118)=217 d) 2x-49=5.3^2 e) 200-(2x+6)=4^3 f) 2(x-51)=2.2^3+20 g) 4(x-3)=7^2-1^10 h) 3^2(x+4)-5^2=5.2^2 i) 9^x-1=9
(X- 3)- 120=0
8x - 3 =0
124+(118-x)=217
156-(x+61)=82
814-(x-305)=712
(X-32)÷16=48
X-32: 16=48
(X-3)-120=0
X-123=0
X=123
8x-3=0
8x=3
x=3/8
124+(118-x)=217
118-x=93
x=25
156-(x+61)=82
x+61=74
x=13
814-(x-305)=712
x-305=102
x=407
(X-32)÷16=48
x-32=768
x=800
X-32: 16=48
x-2=48
x=50
( x - 3 ) - 120 = 0
<=> x - 3 = 120
<=> x = 120 + 3
<=> x = 123
8x - 3 = 0
<=> 8x = 3
<=> x = 3 : 8
<=> x = 3/8
124 + ( 118 - x ) = 217
<=> 118 - x = 217 - 124
<=> 118 - x = 93
<=> x = 118 - 93
<=> x = 25
156 - ( x + 61 ) = 82
<=> x + 61 = 156 - 82
<=> x + 61 = 74
<=> x = 74 -61
<=> x = 13
814 -( x - 305 ) = 712
<=> x - 305 = 814-712
<=> x - 305 = 102
<=> x =102 + 305
<=> x = 407
( x - 32) : 16 = 48
<=> x - 32 = 48 x 16
<=> x - 32 = 768
<=> x = 768 + 32
<=> x = 800
x - 32 : 16 = 48
<=> x - 2 = 48
<=> x = 48 + 2
<=> x = 50
1/ (X - 3) -120 = 0
X - 3 = 0 +120
X - 3 = 120
X = 120 + 3
X = 123
2/ 8X - 3 = 0
8X = 0 + 3
8X = 3
X = 3 : 8
X = 3/8
3/ 124 + ( 118 - X ) = 127
118 - X = 127 - 124
118 - X = 3
X = 118 -3
X = 115
4/ 156 - ( X + 61 ) = 82
X + 61 = 156 - 82
X + 61 = 74
X = 74 - 61
X = 13
5/ 814 - ( X - 305 ) = 712
X - 305 = 814 - 712
X - 305 = 102
X = 102 + 305
X = 407
6/ ( X - 32 ) : 16 = 48
X - 32 = 48 x 16
X - 32 = 768
X = 768 + 32
X = 800
7/ X - 32 : 16 = 48
X - 2 = 48
X = 48 + 2
X = 50
Tim x biet a,2:(x-1)=9 b,156-(x+61)=82 c,13+(x-1)=6
a) 2 : (x - 1) = 9
x - 1 = 2 : 9
x - 1 = \(\frac{2}{9}\)
x = \(\frac{2}{9}+1\)
x = \(\frac{11}{9}\)
b) 156 - (x + 61) = 82
x + 61 = 156 - 82
x + 61 = 74
x = 74 - 61
x = 13
c) 13 + (x - 1) = 6
x - 1 = 6 - 13
x - 1 = -7
x = -7 + 1
x = -6
Bài 1: tìm x
a) 45-( x+ 9) =6
b)11.(x-9)=77
c ) 25+3.(x-8) =106
d ) 7. x - 5 = 21
e ) 156 - 2 .x= 82
Bài 2: tính nhanh
136 . 23 +136 .17 -40 . 36
Bài 1 a) 45 - x - 9 = 6
=> 36 -x = 6
=>x = 30
b) 11x - 99 = 77
=> 11x = 176
=> x = 16
c) 25 + 3x - 24 =106
=> 3x = 105
=> x = 35
d) 7x - 5 = 21
=> 7x = 26
=> x = 26/7
e) 156 - 2x = 82
=> 2x = 74
=> x = 37
Bài 2
136. 23 + 136.17 - 40 . 36
= 136 ( 23 + 17 ) - 40 .36
= 136 . 40 - 40 . 36
= 40 ( 136 - 36 )
= 40 . 100
= 4000
1a. 45 - (x + 9) = 6
x + 9 = 45 - 6
x = 39 - 9
x = 30
b. 11. (x - 9) = 77
x - 9 = 77 : 11
x = 7 + 9
x = 16
c. 25 +3. (x - 8) = 106
3(x - 8) = 106 - 25
x - 8 = 81 : 3
x = 27 + 8
x = 35
d. 7(x - 5) = 21
x - 5 = 21 : 7
x = 3 + 5
x = 8
e. 156 - 2x = 82
2x = 156 - 82
x = 74 : 2
x = 37
2. 136 . 23 + 136 . 17 - 40 . 136
= 136 . (23 + 17 - 40)
= 136 . 0
= 0
Bài 1: tìm x
a) 45-( x+ 9) = 6
x + 9 = 45 - 6
x + 9 = 39
x = 39 - 9
x = 30
b)11.(x-9)=77
x - 9 = 77 : 11
x - 9 = 7
x = 7 + 9
x = 16
c ) 25+3.(x-8) =106
3 . ( x - 8 ) = 106 - 25
3 . ( x - 8 ) = 81
x - 8 = 81 : 3
x - 8 = 27
x = 27 + 8
x = 35
d ) 7. x - 5 = 21
7 . x = 21 + 5
7 . x = 26
x = 26 : 7
x = 26/7
e ) 156 - 2 .x= 82
2 . x = 156 - 82
2 . x = 74
x = 74 : 2
x = 37
Bài 2: tính nhanh
136 . 23 +136 .17 -40 . 36
= 136 . ( 23 + 17 ) - 40 . 36
= 136 . 40 - 40 . 36
= 40 . ( 136 - 36 )
= 40 × 100
= 4 000
1.Tìm số tự nhiên x biết 1) (x-35) -120=0 2) 310-(118-x) =217 3) 156-(x+61)=82 4) 814-(x-305)=712 5) 100-7-(x-5)=58 6) 12(x-1):3=4^3+2^3 7) 24+5x=7^5:7^3 8) 5.(x-1) :3=4^3+2^3 9) 5(x-4)^2-7=13 10) (x+1)+(x+2)+....(x+30)=795 Giúp em với Mai em đi học rồi Help
1) (x - 35) - 120 = 0
x - 35 = 120
x = 120 + 35
x = 155
2) 310 - (118 - x) = 217
118 - x = 310 - 217
118 - x = 93
x = 118 - 93
x = 25
3) 156 - (x + 61) = 82
x + 61 = 156 - 82
x + 61 = 74
x = 74 - 61
x = 13
4) 814 - (x - 305) = 712
x - 305 = 814 - 712
x - 305 = 102
x = 102 + 305 = 407
5) 100 - 7 - (x - 5) = 58
x - 5 = 93 - 58
x - 5 = 35
x = 35 + 5 = 40
6) 12(x - 1) : 3 = 43 + 23
4(x - 1) = 72
x - 1 = 18
x = 18 + 1 = 19
7) 24 + 5x = 75 : 73
24 + 5x = 49
5x = 25
x = 25 : 5 = 5
8) 5(x - 1) : 3 = 43 + 23
\(\dfrac{5}{3}\left(x-1\right)=72\)
x - 1 = \(\dfrac{216}{5}\)
x = 221/5
9) 5(x - 4)2 - 7 = 13
5(x - 4)2 = 20
(x - 4)2 = 4
\(\Rightarrow\left[{}\begin{matrix}x-4=2\\x-4=-2\end{matrix}\right.\) \(\Rightarrow\left[{}\begin{matrix}x=6\\x=2\end{matrix}\right.\)
10) (x + 1) + (x + 2) + ... + (x + 30) = 795
=> (x + x + x + ... + x) + (1 + 2 + 3 +...+ 30) = 795 (1)
Đặt A = 1 + 2 + 3 +...+ 30
Số số hạng trong A là: (30 - 1) : 1 + 1 = 30 (số)
Tổng A bằng : (30 + 1).30 : 2 =465
Thay A = 465 vào (1) , ta được:
30x + 465 = 795
=> 30x =330
=> x =11
1: =>x-35=120
=>x=120+35=155
2: =>118-x=310-217=93
=>x=118-93=25
3: =>x+61=156-82=74
=>x=74-61=13
4: =>x-305=814-712=102
=>x=102+305=407
5: =>93-(x-5)=58
=>x-5=35
=>x=40
6: =>4(x-1)=64+8=72
=>x-1=18
=>x=19
7: =>5x+24=49
=>5x=25
=>x=5
8: =>5(x-1):3=4^3+2^3=64+8=72
=>5(x-1)=216
=>x-1=216/5
=>x=221/5
Tìm x , biết :
a) 14-5+x=30
b) 45-(3+x)=14
c)18+(-3+x)-(44-x)=55
d) (x-45).27=0
e) 25.(42-x)=23
g) 156-(x+61)=82
h) 70-5(x-3)=45
i) | x+2 | = -(-8)+|-7|
k) (x-2)2 = 30-2.7
\(a,14-5+x=30\)
\(\Rightarrow9+x=30\Rightarrow x=30-9\)
\(\Rightarrow x=21\)
\(b,45-\left(3+x\right)=14\)
\(\Rightarrow3+x=45-14\)
\(\Rightarrow3+x=31\Rightarrow x=31-3\)
\(\Rightarrow x=28\)
\(c,18+\left(-3+x\right)-\left(44-x\right)=55\)
\(\Rightarrow18-3+x-44+x=55\)
\(\Rightarrow2x-29=55\Rightarrow2x=55+29\)
\(\Rightarrow2x=84\Rightarrow x=84:2\)
\(\Rightarrow x=42\)
\(d,\left(x-45\right).27=0\)
\(\Rightarrow x-45=0\Rightarrow x=45\)
\(a,14-5+x=30\)
\(\Rightarrow9+x=30\)
\(\Rightarrow x=30-9=21\)
\(b,45-\left(3+x\right)=14\)
\(\Rightarrow3+x=45-14=31\)
\(\Rightarrow x=31-3=28\)
231-(x-6)=1339:13
70-5.(2x-3)=45
156-(x+61)=82
6.(5x+35)=330
936-(4x+24)=72
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, 231 - ( x - 6 ) = 1339 : 13
231 - ( x -6 ) = 103
x - 6 = 231 - 103 = 128
x = 128 + 6 = 134
b, 70 - 5 (2x -3 ) = 45
5 ( 2x -3 ) = 70 - 45 = 25
( 2x -3 ) = 25 : 5 = 5
2x = 5 + 3 = 8
x = 8 : 2 = 4
c, 156 - ( x + 61 ) = 82
x + 61 = 156 - 82 =74
x = 74 - 61
x = 13
d, 6 ( 5x + 35 ) = 330
5x + 35 = 330 : 6 = 55
5x = 55 - 35 = 20
x = 20 : 5 = 4
e, 936-(4x+ 24 ) = 72
4x + 24 = 936 - 72 = 864
4x = 864 - 24 = 840
x = 840 : 4 = 210
Chuc ban hoc tot nhe
tìm x
70-5 .(2x-3) =45
156 -(x cộng 61 ) =82
6.(5x cộng 35) =330
936- (4x cộng 24) =72
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 \(x=210\)
\(70-5.\left(2x-3\right)\)\(=45\)
\(5.\left(2x-3\right)\)\(=\)\(70-45\)
\(5.\left(2x-3\right)\)\(=25\)
\(2x-3=25:5\)
\(2x-3=5\)
\(2x=8\)
\(x=8:2\)
\(x=4\)
\(156-\left(x+61\right)\)\(=82\)
\(x+61=156-82\)
\(x+61=74\)
\(x=74-61\)
\(x=13\)
\(6.\left(5x+35\right)\)\(=330\)
\(5x+35=330:6\)
\(5x+35=55\)
\(5x=55-35\)
\(5x=20\)
\(x=20:5\)
\(x=4\)
\(936-\left(4x+24\right)\)\(=72\)
\(4x+24=936-72\)
\(4x+24=864\)
\(4x=864-24\)
\(4x=840\)
\(x=840:4\)
\(x=210\)
Tìm x :
a) 70 - 5 . ( 2x - 3 ) = 45
5 . ( 2x - 3 ) = 70 - 45
5 . ( 2x - 3 ) = 25
2x - 3 = 25 : 5
2x - 3 = 5
2x = 5 + 3
2x = 8
x = 8 : 2
x = 4
b) 156 - ( x + 61 ) = 82
x + 61 = 156 - 82
x + 61 = 74
x = 74 - 61
x = 13
c) 6 . ( 5x + 35 ) = 330
5x + 35 = 330 : 6
5x + 35 = 55
5x = 55 - 35
5x = 20
x = 20 : 5
x = 4
d) 936 - ( 4x + 24 ) = 72
4x + 24 = 936 - 72
4x + 24 = 364
4x = 364 - 24
4x = 340
x = 340 : 4
x = 85