` -( -8 ) - 9 +10 + ( -14 ) + ( -12 )`
` = 8 - 9 + 10 - 14 - 12`
`= -1 + 10 - 14 - 12`
` = 9 - 14 - 12`
`=-5 - 12`
` = -17`
`-9 + 17 - 18 + 12 - 23`
` = 8 - 18 + 12 - 23`
`=-10 +12 - 23`
`=2 - 23`
`=-21`
` -( -17 ) - ( +15 ) + 18 - 20`
`=17 -15 + 18 - 20`
`=2 + 18 - 20`
`=20-20`
`=0`
`-14 + ( -13 ) - ( -9 ) - 5`
` = -14 - 13 + 9 - 5`
`=-27 + 8 -5`
`=-18 -5`
`=-23`
`-12 + ( +14 ) - 17 + ( -3 )`
`=-12 - 14 - 17 - 3`
`=-26 - 17-3`
`=-43-3`
`=-46`
` 11 - 15 + 13 - 17 + 8 - 4`
`=-4 + 13 - 17 + 8 - 4`
`=9-17 + 8-4`
`=-8 + 8 - 4`
`=0 -4`
`= -4`
Bài 1: Tính
a). \(-\left(-8\right)-9+10+\left(-14\right)+\left(-12\right)\)
\(=8-9+10+\left(-14\right)+\left(-12\right)\)
\(=\left(-1\right)+10+\left(-14\right)+\left(-12\right)\)
\(=9+\left(-14\right)+\left(-12\right)\)
\(=\left(-5\right)+\left(-12\right)\)
\(=-17\)
_________________________________
b). \(-9+17-18+12-23\)
\(=8-18+12-23\)
\(=\left(-10\right)+12-23\)
\(=2-23\)
\(=-21\)
_________________________________
c). \(-\left(-17\right)-15+18-20\)
\(=17-15+18-20\)
\(=2+18-20\)
\(=20-20\)
\(=0\)
_______________________________
d). \(-14+\left(-13\right)-\left(-9\right)-5\)
\(=-27-\left(-9\right)-5\)
\(=-18-5\)
\(=-23\)
____________________________________
e). \(-12+14-17+\left(-3\right)\)
\(=2-17+\left(-3\right)\)
\(=\left(-15\right)+\left(-3\right)\)
\(=-18\)
_____________________________________
g). \(11-15+13-17+8-4\)
\(=\left(11-15\right)+\left(13-17\right)+\left(8-4\right)\)
\(=\left(-4\right)+\left(-4\right)+4\)
\(=\left(-8\right)+4\)
\(=-4\)
Tui sợ sai
