Toán Lớp 7: Tìm giá trị biểu thức:
A=(1/2+1/3+….+1/2021).(1+1/2+1/3+…+1/2020)-(1+1/2+1/3+…+1/2021).(1/2+1/3+…..+1/2020)
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Toán Lớp 7: Tìm giá trị biểu thức:
A=(1/2+1/3+….+1/2021).(1+1/2+1/3+…+1/2020)-(1+1/2+1/3+…+1/2021).(1/2+1/3+…..+1/2020)
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