Toán Lớp 5: 1 – 2 + 3 – 4 + … + 2021 – 2022 + 2023
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Toán Lớp 5: 1 – 2 + 3 – 4 + … + 2021 – 2022 + 2023
Gấpp
Comments ( 2 )
=-1+(-1)+…+(-1)+2023
có 1011 số -1
=-1.1011+2023
=1012