bài tìm x 124+(118-X)-215
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) \(2^x+2^{x+1}+2^{x+2}=56\)
\(2^x.1+2^x.2+2^x.2^2=56\)
\(2^x\left(1+2+4\right)=56\)
\(2^x=8\)
\(2^x=2^3\)
\(x=3\)
\(2^x=8\)
bài 1 tìm x
a/ [x -35]-120=0
b/124+[118-x]=217
c/ 156-[x+61]=82
a)
(x-35)-120=0
=>x-35=0+120
=>x-35=120
=>x=120-35
=>x=85
b)
124+(118-x)=217
=>118-x=217-124
=>118-x=93
=>x=118-93
=>x=25
c) 125-(x+61)=82
=>x+61=125-82
=>x+61=43
=>x= 43-61
=>x= -18
a)
(x-35)-120=0
=>x-35=0+120
=>x-35=120
=>x=120-35
=>x=85
b)
124+(118-x)=217
=>118-x=217-124
=>118-x=93
=>x=118-93
=>x=25
c) 125-(x+61)=82
=>x+61=125-82
=>x+61=43
=>x= 43-61
=>x= -18
a)
(x-35)-120=0
=>x-35=0+120
=>x-35=120
=>x=120-35
=>x=85
b)
124+(118-x)=217
=>118-x=217-124
=>118-x=93
=>x=118-93
=>x=25
c) 125-(x+61)=82
=>x+61=125-82
=>x+61=43
=>x= 43-61
=>x= -18
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
|
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)
|
a: =>x+61=74
hay x=13
b: =>x-35=120
hay x=155
d: =>7x=721
hay x=103
bài 13: tìm x biết
a. 124 + (118 - x) = 217
b. 156- (x + 61) = 82
c. 219 - 7(x + 1) = 100
d. (3x - 6). 3 = 3^4
e. 231 - (x - 6) = 1339 : 13
a) 124 + (118 - x) = 217
118 - x = 217 - 124
118 - x = 93
x = 118 - 93
x = 25
b) 156 - (x + 61) = 82
x + 61 = 156 - 82
x + 61 = 74
x = 74 - 61
x = 13
c) 219 - 7(x + 1) = 100
7(x + 1) = 219 - 100
7(x + 1) = 119
x + 1 = 119 : 7
x + 1 = 17
x = 17 - 1
x = 16
d) (3x - 6).3 = 3⁴
3x - 6 = 3⁴ : 3
3x - 6 = 3³
3x - 6 = 27
3x = 27 + 6
3x = 33
x = 33 : 3
x = 11
e) 231 - (x - 6) = 1339 : 13
231 - (x - 6) = 103
x - 6 = 231 - 103
x - 6 = 128
x = 128 + 6
x = 134
a) 124 + (118 - x) = 217
118 - x = 217 - 124
118 - x = 93
x = 118 - 93
x = 25
b) 156 - (x + 61) = 82
x + 61 = 156 - 82
x + 61 = 74
x = 74 - 61
x = 13
c) 219 - 7(x + 1) = 100
7(x + 1) = 219 - 100
7(x + 1) = 119
x + 1 = 119 : 7
x + 1 = 17
x = 17 - 1
x = 16
d) (3x - 6) . 3 = 34
(3x - 6) . 3 = 81
(3x - 6) = 81 : 3
(3x - 6) = 27
3x = 27 + 6
3x = 33
x = 33 : 3
x = 11
e) 231 - (x - 6) = 1339 : 13
231 - (x - 6) = 103
(x - 6) = 231 - 103
x - 6 = 128
x = 128 + 6
x = 134
cô cấm dùng máy tính -)
lớp 9 ms đc dùng:_)
tìm x 124+(118-x)-125
đề đúng bn ạ tại bn ko bt lam thôi
coi minh làm nè
124+118-x-125
x=124+118-125
x=242-125
x=117
Tìm số tự nhiên x, biết: 124 + (118 – x ) = 217
124 + (118 – x ) = 217
118 – x = 217 – 124
118 – x = 93
x = 118 – 93
x = 25.
Tìm x:
124 + ( 118 - x ) = 217
124+(118-x)=217
(118-x)=217-124
(118-x)=93
x=118-93
x=25
Kết quả:25
124+(118-x)=217
118-x=217-124
118-x=93
-x=93-118
-x = -25
x=25
124+(118-x)=217
(118-x)=217-124
118-x = 93
-x = 118-93
-x = 25
x =-25
124 + ( 118 - x ) = 217
tìm x
124 + ( 118 - x ) = 217
118 - x = 217 - 124
118 - x = 93
x = 118 - 93
x = 25
=========
118 - x = 217 - 124
118 - x = 83
x = 118 - 83
x = 45
124+(118-x)=217
118-x=217-124
118-x=93
x=118-93
x=25
k mk nhé là ơn đi
Tìm x:
h) 124+ (118 - x) =217
i) 156- (x + 61)= 82
h) \(124+\left(118-x\right)=217\Rightarrow118-x=217-124\Rightarrow118-x=93\Rightarrow x=118-93\Rightarrow\)\(x=25\)
Vậy \(x=25\)
i) \(156-\left(x+61\right)=82\)\(\Rightarrow x+61=156-82\Rightarrow x+61=74\Rightarrow x=74-61\)\(\Rightarrow x=13\)
Vậy \(x=13\)
h) 124+(118-x)=217
118-x=217-124
118-x=93
x=118-93
x=25
i) 156-(x+61)=82
x+61=156-82
x+61=74
x =74-61
x =13
124+(118-x)=217
118-x=217-124
118-x=93
x=118-93
x=25
vậyx=25
156-(x+61)=82
x+61=156-82
x+61=74
x=74-61
x=13
vậy x=13