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a) (–30) + (–5) = –(30 + 5) = –35.
b) (–7) + (–13) = – (7 + 13) = –20;
c) (–15) + (–235) = –(15 + 235) = –250.
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a)
5 3 + − 14 3 < x < 8 5 + 4 10 ⇔ − 3 < x < 2 x ∈ − 2 ; − 1 ; 0 ; 1
b)
1 5 + 2 35 < x < − 3 7 + 4 5 ⇔ 9 35 < x < 13 35 x ∈ ∅
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a) x ∈ {-2;-1;;0;1;2;3}
b) x ∈ {10;11;12}
c) x ∈ {0;1;2;3;4;5}
d) x ∈ {-1;0;1;2}
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1.Tính
a) ( - 30 ) + ( - 5 ) =-35
b) ( - 7 ) + ( - 13 ) =-20
c) ( -15 ) + ( 235)=220
d) 16 + ( - 6 ) =10
e) 14 + ( - 6 ) =8
f) ( - 8 ) + 12 =4
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a) \(-\left(76-35+15\right)+\left[18-27+\left(-17\right)\right]\)
\(=-76+35+15+18-27-17\)
\(=-52\)
b) \(167+\left[127-235-\left(-16\right)\right]+\left(-67\right)\)
\(=167+127-235+16-67\)
\(=8\)
c) \(\left(-19\right)+165-\left[27+\left(-21\right)-\left(+72\right)\right]\)
\(=\left(-19\right)+165-27+21+72\)
\(=212\)
d) \(89.\left(-2\right)+\left[20+\left(-2\right).\left(-5\right)-85\right]\)
\(=\left(-178\right)+\left(20+10-85\right)\)
\(=\left(-178\right)+20+10-85\)
\(=-233\)
(-235) + 15 = -220