[Gi\u1ea3i To\u00e1n 10] Ch\u01b0\u01a1ng 5: Th\u1ed1ng k\u00ea\/ B\u00e0i 3: S\u1ed1 trung b\u00ecnh c\u1ed9ng. S\u1ed1 trung v\u1ecb. M\u1ed1t<\/a><\/blockquote><\/iframe>