a)-37+54+(-70)+(-163)+246
=[(-37)+(-163)]+(54+246)+(-70)
=-200+300+(-70)
=100+(-70)
=30
b)-359+181+(-123)+350+(-172)
=-359+181-123+350-172
=(-359+350)+(181-172)-123
=-9+9-123
=0-123
=-123.
c)-69+53+46+(-94)+(-14)+78
=-69+53+46-94-14+78
=(78-94+46)+(53-69-14)
=30+(-30)
=0
d)13-12+11+10-9+8-7-6+5-4+3+2-1
=13-(12+1)-(11+2)-(10+3)-(9+4)-(8+5)+(7+6)
=13-13-13-13-13-13+13
=0+13
=13
~ Học tốt ~