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nghiapham2405
2 năm trước
Bài 1 A) x= -1/4 +3/7 B)x/4 + x/5 = -9/10 C) x/30 = -3/5 + 7/30 Bài 2 So sánh 1/10 + 1/11 + 1/12 + 1/13 + 1/14 và 1/2 Chứng tỏ 1/10 + 1/11 + 1/12 + ...... + 1/19 < 1
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