12.( x - 1 ) : 3 = 35
2 . x - 138 =72
310 - ( 118 - x ) 217
Bài tìm x
Câu 58 :
310+(118 - x) =217
A. 217 B. 118 C. 211 D. 310
Câu 59 :
2x - 138 = 8 × 9
A. 105 B. 8 C. 16 D. 32
Câu 60 :
4x3 +12 = 120
A. 3 B. 4 C. 5 D. 6
Mọi người giúp em nha (◍•ᴗ•◍)
1.Tìm x
a) 310-(118-x)=217
b) 814-(x-305)=712
c)5(x+35)=515
d)(6.x-39):3].28=5628
e)2.x-138=23.22
g)20-[7.(x-3)+4]=2
a) 310-(118-x)=217
118-x=310-217
118-x=93
x=118-93
x=25
b) 814-(x-305)=712
x-305=814-712
x-305=102
x =102+305
x = 407
c)5(x+35)=515
x+35 =515:5
x+35 =103
x =103-35
x =68
\(a,310-\left(118-x\right)=217\) \(c,5\left(x+35\right)=515\)
\(118-x=310-217\) \(x+35=515:5\)
\(118-x=93\) \(x+35=103\)
\(x=118-93\) \(x=103-35\)
\(x=25\) \(x=68\)
\(b,814-\left(x-305\right)=712\) \(\left[\left(6.x-39\right):3\right].28=5628\)
\(x-305=814-712\) \(\left(6.x-39\right):3=5628:28\)
\(x-305=102\) \(\left(6.x-39\right):3=201\)
\(x=102+305\) \(6.x-39=201x3\)
\(x=407\) \(6.x-39=603\)
\(6x=603+39\)
\(6x=642\)
\(x=107\)
\(e,2.x-138=2^3.2^2\)
\(2.x-138=32\)
\(2.x=32+138\)
\(2.x=170\)
\(x=170:2\)
\(x=85\)
310 - ( 118-x) = 217
118 - x = 310 - 217
118 -x = 93
x = 118 - 93
x = 25
Tìm x :
a) 2x - 138 = 2^3 . 3^2
b) 20 - [ 7 . ( x - 3 ) + 4 ] = 2
c) 310 - ( 118 - x ) = 217
d) 2010^5 . ( x - 60 ) = 2010^6
e) 5 . ( x + 35 ) = 515
f) [ ( 6x - 39 ) : 3 ] . 28 = 5628
g) 720 : [ 41 - ( 2x - 5 ) ] = 2^3 . 5
h) ( 6x - 3^4 ) . 7^3 = 3 . 7^4
v) 4x^3 + 12 = 120
m) 3 . 2^x - 3 = 45
--- Giải nhanh, đúng sẽ hậu tạ. '-' ( Trong khả năng ) ---
Bài 2: Tìm x:
a) 156 – (x+ 61) = 82 b) (x-35) -120 = 0 c) 124 + (118 – x) = 217 d) 7x – 8 = 713 e) x- 36:18 = 12 f) (x- 36):18 = 12 g) (x-47) -115 = 0 |
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Bài 3: Tính nhanh
a) 58.75 + 58.50 – 58.25 b) 27.39 + 27.63 – 2.27 c) 128.46 + 128.32 + 128.22 d) 66.25 + 5.66 + 66.14 + 33.66 e) 12.35 + 35.182 – 35.94 | f) 48.19 + 48.115 + 134.52 g) 27.121 – 87.27 + 73.34 h) 125.98 – 125.46 – 52.25 i) 136.23 + 136.17 – 40.36 j) 17.93 + 116.83 + 17.23 | k) 35.23 + 35.41 + 64.65 l) 29.87 – 29.23 + 64.71 m) 19.27 + 47.81 + 19.20
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Bài 4: Tính giá trị của biểu thức sau:
a) 2763 + 152 b) (-7) + (-14) c) (-35) + (-9) d) (-5) + (-248) e) (-23) + 105 f) 78 + (-123) g) 23 + (-13) h) (-23) + 13 i) 26 + (-6) | j) 80 + (-220) k) (-23) + (-13) l) (-26) + (-6) | m) 12 – 34 n) -23 – 47 o) 31 – (-23) p) -9 – (-5) q) 6 – (8 – 17) r) 19 + (23 – 33) s) (-12 – 44) + (-3) t) 4 – (-15) u) -29 – 23 | v) 99 – [109 + (-9)] w) (-75) + 50 x) (-75) + (-50) y) (-23) + 13 + ( - 17) + 57 z) 14 + 6 + (-9) + (-14)
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a: =>x+61=74
hay x=13
b: =>x-35=120
hay x=155
d: =>7x=721
hay x=103
a) (x+79)-121=0
b) 124+(118-x)=217
c) 3045:x=15
d) 6.x+5=623
e)12.(x-1)=0
f) 0:(x-1)=0
a)
\(x+79=0+121\)
\(x+79=121\)
\(x=121-79\)
\(x=42\)
b)
\(118-x=217-124\)
\(118-x=93\)
\(x=118-93\)
\(x=25\)
c)
\(x=3045:15\)
\(x=203\)
d)
\(6x=623-5\)
\(6x=618\)
\(x=618:6\)
\(x=103\)
e)
\(x-1=0:12\)
\(x-1=0\)
\(x=0+1\)
\(x=1\)
f)
0 chia cho mọi số khác 0 đều bằng 0
Vậy chỉ cần \(x-1\ne0\)
\(x\ne0+1\)
\(x\ne1\)
giải giúp mình
a ) 124 + ( 118 - x ) = 217
b )( x - 36 ) : 18 = 12
a) 124 + (118 - x) = 217
242 - x = 217
x = 242 - 217
x = 25
(x-36)/18=12
=>x-36=12*18
=>x-36=216
=>x=216+36
=>x=252
Bài 6: Tìm số nguyên x,biết:
a) x+ 118 =218 |
b) 18 – x =-17 |
c) (-18) – x =-17 |
d)124 +(118 – x)=217 |
e) (3x – 6).3 = 34 |
g) 23.(42 – x) = 46 |
h) 84 – (3x + 8) = 34 |
i) 3(2x + 1) -19 = 14 |
k) 6x – 302 = 23.5 |
m) (x -1)2 = 81 |
n) 2x+1- 5 =27 |
m) 2x+ 2x+1+ 2x+2 = 56 |
a) x + 118 = 218
x = 218 – 118
x = 100
b) 18 – x = -17
X = 18 – (-17)
X = 35
c) (-18) – x = -17
X = (-18) – (-17)
X = -1
d)124 + (118 – x) = 217
118 – x = 93
X = 118 – 93
X = 25
e) (3x – 6).3 = 34
(3x – 6).3 = 81
3x – 6 = 27
3x = 33
ð X = 11
g) 23.(42 – x) = 46
42 – x = 2
ð X = 40
h) 84 – (3x + 8) = 34
3x + 8 = 84 – 34
3x + 8 = 50
3x = 50 – 8
3x = 42
X = 42 : 3
ð X = 14
i) 3.(2x + 1) – 19 = 14
3.(2x + 1) = 14 + 19
3.(2x + 1) = 33
2x + 1 = 33 : 3
2x + 1 = 11
2x = 11 – 1
2x = 10
X = 10 : 2
ð X = 5
k) 6x – 302 = 23.5
6x – 302 = 40
6x = 40 + 302
6x = 342
X = 342 : 6
ð X = 57
m) (x – 1)2 = 81
(x – 1)2 = 92
ð X – 1 = 9
ð X = 9 + 1
ð X = 10
n) 2x+1 – 5 = 27
2x+1 = 27 + 5
2x+1 = 32
2x+1 = 25
ð X = 4
a) \(x+118=218\)
\(x=218-118\)
\(x=100\)
b)\(18-x=-17\)
\(-x=-18-17\)
\(-x=-35\)
\(x=35\)
c)\(\left(-18\right)-x=-17\)
\(-x=18-17\)
\(-x=1\)
\(x=-1\)
d)\(124+\left(118-x\right)=217\)
\(118-x=217-124\)
\(118-x=93\)
\(x=25\)
e) \(\left(3x-6\right).3=3^4\)
\(3x-6=3^3\)
\(3x-6=27\)
\(x=11\)
g)\(23.\left(42-x\right)=46\)
\(42-x=2\)
\(x=40\)
h) \(84-\left(3x+8\right)=34\)
\(3x+8=50\)
\(x=14\)
i) \(3\left(2x+1\right)-19=14\)
\(3\left(2x+1\right)=33\)
\(2x+1=11\)
\(x=5\)
k) \(6x-302=2^3.5\)
\(6x-302=8.5\)
\(x=57\)
m) \(\left(x-1\right)^2=81\)
\(\left(x-1\right)^2=9^2\)
\(x-1=9\)
\(x=10\)
n) \(2^{x+1}-5=27\)
\(2^{x+1}=32\)
\(2^{x+1}=2^5\)
\(x+1=5\)
\(x=4\)
m) \(2^x+2^{x+1}+2^{x+2}=56\)
\(2^x.1+2^x.2+2^x.2^2=56\)
\(2^x\left(1+2+4\right)=56\)
\(2^x=8\)
\(2^x=2^3\)
\(x=3\)
\(2^x=8\)
12 + ( 118 - x ) = 217. Giups nhanh nha mai nộp rùi
12+(118-x)=217
118-x=217-12
118-x=205
x=205-118
x=77
12+(118-x)=217
118-x=217-12
118-x=205
x=205-118
x=77
12+(118-x)=217
(118-x)=205
x =205-118
x=87
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