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\(-10< x< 8\)
\(\Rightarrow x\in\left\{-9;-8;...;7\right\}\)
\(x=-9+\left(-8\right)+...+7\)
\(\Rightarrow x=\left(-9\right)+\left(-8\right)=-17\)
P/s: Các câu còn lại tương tự ((:
a, \(-6x=18\)
\(\Rightarrow-x=3\)
\(\Rightarrow x=-3\)
b, \(2x-\left(-3\right)=7\)
\(2x+3=7\)
\(\Rightarrow2x=4\)
\(\Rightarrow x=2\)
c, \(\left(x-5\right)\left(x+6\right)=0\)
\(\Rightarrow\orbr{\begin{cases}x-5=0\\x+6=0\end{cases}\Rightarrow\orbr{\begin{cases}x=5\\x=-6\end{cases}}}\)
\(a,13-18-\left(-42\right)-15\)
\(=13-18+42-15\)
\(=\left(13-15\right)-\left(18+42\right)\)
\(=-2-60\)
\(=-62\)
\(b,369-4\left[\left(-5\right)+4.\left(-8\right)\right]\)
\(=369-4\left[\left(-5\right)+\left(-32\right)\right]\)
\(=369-4.\left(-37\right)\)
\(=369-\left(-148\right)\)
\(=369+148\)
\(=517\)
\(c,\left(-8\right)^3:\left(-8\right)^2+8\)
\(=-512:64+8\)
\(=-8+8\)
\(=0\)
\(d,\left(-12\right)\left(-13\right)+13.\left(-29\right)\)
\(=156+-377\)
\(=156-377\)
\(=-221\)
12) 17 – 11 – 14 – (-39)
=17-11-14+39
=6-14+39
=-8+39
=31
13) −127 - 18.( 5 - 6)
=-127-18.1
=-145
14) 100 + (+430) + 2145 + (-530)
=530+2145-530
=(530-530)+2145
=0+2145
=2145
15) (+12).13 + 13.(-22)
=13.[12+(-22)]
=13.(-10)
=-130
16) {[14 : (-2)] + 7} : 2012
={-7+7}:2012
=0:2012
=0
17) 13 – 18 – (- 42) - 15
=13-18+42-15
=-5+42-15
=37-15
=22
18) 369 – 4[(-5) + 4.(-8)]
=369-4[-5+(-32)]
=369-4(-37)
=369+148
=517
19) (-12).(-13) +13.(-29)
=12.13+13.(-29)=13.[12+(-29)]=13.(-17)=-221
20) 125 – 4[ 3 – 7.(-2) ]
=125-4[3+14]
=125-4.17
=125-68
=57
21) (-14).9 – 13.(-9)
=(-14).9+13.9
=9.[-14+13]
=9.(-1)
=-9
a) \(13-18-\left(-42\right)-15\)
\(=13-18+42-15\)
\(=\left(13-18-15\right)+42\)
\(=-20+42\)
\(=22\)
b) \(369-4.\left[-5+4.\left(-8\right)\right]\)
\(=369-4.\left[-5+\left(-32\right)\right]\)
\(=369-4.\left(-37\right)\)
\(=369+148\)
\(=517\)
c) \(\left(-8\right)^3\div\left(-8\right)^2+8\)
\(=-8+8\)
\(=0\)
d) \(\left(-12\right).\left(-13\right)+13.\left(-29\right)\)
\(=12.13+13.\left(-29\right)\)
\(=13.\left(-29+12\right)\)
\(=13.\left(-17\right)\)
\(=-221\)
\(a,13-18-\left(-42\right)-15\)
\(=13-18+42-15\)
\(=-5-15+42=-20+42\)
\(=22\)
\(b,369-4.\left[\left(-5\right)+4.\left(-8\right)\right]\)
\(=369-4.\left[-5-32\right]\)
\(=369-4.\left(-37\right)\)
\(=369-\left(-148\right)=517\)
\(c,\left(-8\right)^3:\left(-8\right)^2+8\)
\(=-8+8=0\)
\(d,\left(-12\right).\left(-13\right)+13.\left(-29\right)\)
\(=12.13+13.\left(-29\right)\)
\(=13.\left(12-29\right)\)
\(=13.\left(-17\right)=-221\)
\(e,-2-13+\left(-14\right)-19\)
\(=-2-13-14-19\)
\(=-\left(2+13+14+19\right)=-48\)
\(f,323-6.\left[3-7.\left(-9\right)\right]\)
\(=323-6.\left[3+63\right]\)
\(=323-6.66=323-396\)
\(=-73\)
\(g,-19-13-\left(-24\right)+11\)
\(=-19-13+24+11\)
\(=-32+35=3\)
\(h,-15.12-8.\left(-12\right)\)
\(=-15.12+8.12\)
\(=12.\left(8-15\right)=12.7=84\)