Đáp án:+
$\text{ a) x = 17 }$
$\text{b) x = - 14 }$
$\text{c )x = 2 }$
$\text{ d) x = -4 }$
Giải thích các bước giải:
$\text{a) 35 - x = 16 - (-2) }$
$\text{35 - x = 18 }$
$\text{x = 35 - 18 }$
$\text{x = 17 }$
$\text{b) x - 2 = (-7) - 9 }$
$\text{ x - 2 = - 16 }$
$\text{ x = - 16 + 2 }$
$\text{ x = - 14 }$
$\text{c) 15 - x = 11- (-2) }$
$\text{c) 15 - x = 13 }$
$\text{x = 15 - 13 }$
$\text{x = 2 }$
$\text{x - 1 = ( -2 ) -3 }$
$\text{ x - 1 =- 5 }$
$\text{ x = -5 +1 }$
$\text{ x = -4 }$
