5A : Tìm số nguyên x a) 35-x=16-(-2) b) x-2=(-7)-9 c) 15-x=11-(-2) d) x-1=(-2)-3

Đáp án:+
$\text{ a) x = 17 }$
$\text{b) x  = –  14 }$
$\text{c )x = 2 }$

$\text{ d) x  = -4  }$

Giải thích các bước giải:

$\text{a) 35 – x = 16 – (-2) }$

$\text{35 – x = 18 }$

$\text{x = 35 – 18 }$

$\text{x = 17 }$

$\text{b) x – 2 = (-7) – 9 }$

$\text{ x – 2 = – 16 }$

$\text{ x  = –  16 + 2 }$

$\text{ x  = –  14 }$

$\text{c) 15 – x = 11- (-2) }$

$\text{c) 15 – x = 13 }$

$\text{x = 15 – 13  }$

$\text{x = 2 }$

$\text{x – 1 = ( -2 ) -3  }$

$\text{ x – 1 =- 5  }$

$\text{ x  = -5 +1  }$

$\text{ x  = -4  }$