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duongbui0712
2 năm trước
Câu 4: Biết rằng 1^2+2^2+3^2.....+11^2 = 506 Thì 2^2+4^2+6^2......+22^2 = Câu 5: giá trị của x trong tỉ lệ thức x/15=-4/5 là Câu 6: cho x/-5 và x+y -10 thì Câu 7 : cho a/11=b/15=C/22 và a+b-C= -8
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