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124 + (118 – x ) = 217
118 – x = 217 – 124
118 – x = 93
x = 118 – 93
x = 25.
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
=========
118 - x = 217 - 124
118 - x = 83
x = 118 - 83
x = 45
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
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
a)(x-35)-120=0 b)124+(118-x)=217 c)156-(x+61)=82
x-35 = 0+120=120 118-x =217-124=93 x+61 = 156-82=74
x = 120+35=155 x = 118-93=25 x =74-61=13
suy ra x=155 suy ra x= 25 suy ra x=13
a) ( x - 35 ) - 120 = 0
<=> x - 35 = 120
<=> x = 155
b) 124 + ( 118 - x ) = 217
<=> 118 - x = 93
<=> x = 25
c) 156 - ( x + 61 ) = 82
<=> x + 61 = 74
<=> x = 13
(x-35)-120=0
x-35 = 0 + 120
x-35 = 120
x = 120 + 35
x = 155
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
(x-35)-120=0
x-35 = 0+120
x-35 = 120
x = 120-35
x = 85
124 + (118-x)=217
118-x=217-124
118-x=93
x=118-93
x=25
156-(x+61)=82
x+161=156-82
x+161=74
x=161-74
x=87
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