\(S=\left(-2\right)+4+\left(-6\right)+8+\left(-10\right)+12\)
\(=\left(-2+4\right)+\left(-6+8\right)+\left(-10+12\right)\)
\(=2+2+2\)
\(=6\)
Giải:
S=(−2)+4+(−6)+8+(−10)+12
S=[(−2)+4]+[(−6)+8]+[(−10)+12]
S=(−2)+(−2)+(−2)
S=(−2).3
S=(−6)
S = (-2) + 4 + (-6) + 8 + (-10) + 12
=> S = [(-2) + (-6) + (-10)] + (4 + 8 + 12)
=> S = (-18) + 24
=> S = 6