Lời giải:
$9+(-10)+11+(-12)+13+(-14)+15+(-16)$
$=(9+(-10))+(11+(-12))+(13+(-14))+(15+(-16))$
$=4.(-1)$
$=-4$
9+(-10)+11+(-12)+13+(-14)+15+(-16)
=9-10+11-12+13-14+15-16
=(9-10)+(11-12)+(13-14)+(15-16)
=(-1)+(-1)+(-1)+(-1)
=-4
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