Toán Lớp 6: 1 – 2 – 3 + 4 + 5 – 6 – 7 + 8 + 9 – …. – 99 + 100.
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Toán Lớp 6: 1 – 2 – 3 + 4 + 5 – 6 – 7 + 8 + 9 – …. – 99 + 100.
Comments ( 2 )
=0
=(1 – 2 – 3 + 4) +( 5 – 6 – 7 + 8) + …+(97-98– 99 + 100)
=[(1-2)+(-3+4)])+[(5-6)+(-7+8)]+…+[(97-98)+(-99+100)]
=[(-1)+1]+[(-1)+1]+…+[(-1)+1]
=0+0+…+0
=0