$\color{brown}{Gửi ~e~}$
$\color{blue}{Bài~1}$
`text {a/( - 5) - (- 2) + | - 3| - | - 2 |}`
`text{= (- 5 - 2) + ( 2 + 3 )}`
` text{= - 2}`
`text{b/- ( - 53 + 27)- | - 39 + 45| - (37 + 63)}`
`text{ = 80 - 84 - 100}`
`text{= - 104}`
`text{c/ có :}`
`text{- 5 ≤ x ≤ 3}`
`text{=> x ∈ {-5;-4;-3;-2;-1;0;1;2;3}}`
`text{=> tổng của các số nguyên x là:}`
`text{- 5 + (- 4) + (- 3) + (- 2) + (- 1) + 0 + 1 + 2 + 3 = - 9}`
`text{d/(- 53 + 191) - (37 - 495)}`
`text{= (- 53 - 37) + (191 + 495)}`
`text{ = 596}`
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$\color{blue}{Bài~2}$
`text{a/ - ( - 2021) - (45 + 2021 - 581) - | - 81 |}`
`text{= (2021 - 2021) - 45 + (581 - 81)}`
`text{= 455}`
`text{b/(42 - 69 + 17) - ( 42 + 17) - | -31|}`
`text{= 42 - 69 + 17 - 42 - 17 - 31}`
`text{= (42 - 42) - 69 + (17 - 17 ) - 31}`
`text= -100}`
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$\color{blue}{Bài ~3}$
`text{a/ - 75 - ( x + 20) + 95 = 0}`
`text{ <=> - 75 - ( x + 20) = - 95}`
`text{<=> x + 20 = - 150}`
`text{=> x = - 170 }`
