Ch\u01b0\u01a1ng 1 – B\u00e0i 3: Momen \u0111\u1ed9ng l\u01b0\u1ee3ng. \u0110\u1ecbnh lu\u1eadt b\u1ea3o to\u00e0n momen \u0111\u1ed9ng l\u01b0\u1ee3ng<\/a><\/blockquote><\/iframe>