Tìm số tự nhiên x, biết :
a, ( x – 35 ) – 120 = 0
b, 124 + ( 118 – x ) = 217
c, 156 – ( x + 61 ) = 82
Tìm số tự nhiên x, biết : a, ( x – 35 ) – 120 = 0 b, 124 + ( 118 – x ) = 217 c, 156 – ( x + 61 ) = 82
By Charlie
By Charlie
Tìm số tự nhiên x, biết :
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 = 155
Vậy : x = 155
b, 124 + ( 118 – x ) = 217
=> 118 – x = 217 – 124
=> 118 – x = 93
=> x = 118 – 93
=> x = 25
Vậy : x = 25
c, 156 – ( x + 61 ) = 82
=> x + 61 = 156 – 82
=> x + 61 = 74
=> x = 74 – 61
=> x = 13
Vậy : x = 13
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$\text{Bài làm :}$
$\text{a, ( x – 35 ) – 120 = 0}$
$\text{ x – 35 = 0 + 120}$
$\text{ x – 35 = 120}$
$\text{ x = 120 + 35}$
$\text{ x = 155}$
$\text{b, 124 + ( 118 – x ) = 217}$
$\text{ 118 – x = 217 – 124}$
$\text{ 118 – x = 93}$
$\text{ x = 118 – 93}$
$\text{ x = 25}$
$\text{156 – ( x + 61 ) = 82}$
$\text{ x + 61 = 156 – 82}$
$\text{ x + 61 = 74}$
$\text{ x = 74 – 61}$
$\text{ x = 13}$
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