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lucky_flower1308
2 năm trước
a) Tìm các cặp số nguyên (x,y) sao cho (2+x)(y-7)=10 b) Chứng minh với mọi số nguyên a thì 6a-5/-9a+7 là phân số tối giản c) So sánh 2 phân số sau: A= 13^19+1 / 13^18+1 và B= 13^20 / 13^19+1
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