Question

Bài 1. Tìm số nguyên x , biết: a) 12+(4−x)=−5

b) −(−x+13−142)+18=55

Answer 1

\(\text{ a) 12+(4−x)=−5}\\ 4-x=-5-12\\ 4-x=-17\\ x=4-\left(-17\right)\\ x=21\)

Answer 2

\(\text{b) −(−x+13−142)+18=55}\\ x-13+142+18=55\\ x-173=55\\ x=55+173=228\)

Answer 3

b, <=> x-13+142 +18= 55

<=> x=-92 

Answer 4

b) -(-x+13-142)+18=55

=> x - 13 + 142 + 18 = 55

<=> x = 55 + 13 - 142 - 18

<=> x = -92

Answer 5

 x=21

Answer 6

x=−92