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bivabieu
2 năm trước
Tính A=1/100.99-1/98.98-.....-1/3.2-1/2.1 B=(1/4.9+1/9.14+1/14.19+...+1/44.49).1-3-9-7-..-49/89 C=1/1.2.3.4+1/2.3.4.5+...+1/27.28.29.30
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