[Gi\u1ea3i To\u00e1n 10] Ch\u01b0\u01a1ng 4: B\u1ea5t \u0111\u1eb3ng th\u1ee9c. B\u1ea5t ph\u01b0\u01a1ng tr\u00ecnh\/ B\u00e0i 3: D\u1ea5u c\u1ee7a nh\u1ecb th\u1ee9c b\u1eadc nh\u1ea5t<\/a><\/blockquote><\/iframe>