Toán Lớp 6: Thực hiện phép tính sau:
1+2-3-4+5+6-7-8+9+…+2018-2019-2020+2021
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Toán Lớp 6: Thực hiện phép tính sau:
1+2-3-4+5+6-7-8+9+…+2018-2019-2020+2021
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=1+(2-3-4+5)+(6-7-8+9)+..+(2018-2019-2020+2021)