Toán Lớp 5: a)A=1-2+3-4+5-6+…+73-74+75
b)50-49+48-47+46-45+…+4-3+2-1 làm bằng hai cahs
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Toán Lớp 5: a)A=1-2+3-4+5-6+…+73-74+75
b)50-49+48-47+46-45+…+4-3+2-1 làm bằng hai cahs
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