> For the complete documentation index, see [llms.txt](https://hotro-hoadonbachkhoa.pmbk.vn/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hotro-hoadonbachkhoa.pmbk.vn/cac-buoc-de-bat-dau-su-dung-phan-mem/1.9-tuy-chon.md).

# 1.9 Tùy chọn

{% content-ref url="/pages/qSnckGvhXEDI2dqQt1gh" %}
[1.9.1 Tùy chọn chung](/cac-buoc-de-bat-dau-su-dung-phan-mem/1.9-tuy-chon/1.9.1-tuy-chon-chung.md)
{% endcontent-ref %}

{% content-ref url="/pages/De2NQaGlHdiuU1XmGyQq" %}
[1.9.2 Định dạng số](/cac-buoc-de-bat-dau-su-dung-phan-mem/1.9-tuy-chon/1.9.2-dinh-dang-so.md)
{% endcontent-ref %}

{% content-ref url="/pages/6VrCihz8Hx8iyZgVcFMG" %}
[1.9.3 Thiết lập công cụ ký](/cac-buoc-de-bat-dau-su-dung-phan-mem/1.9-tuy-chon/1.9.3-thiet-lap-cong-cu-ky.md)
{% endcontent-ref %}

{% content-ref url="/pages/9e93cB49JwCPdXI23f6w" %}
[1.9.4 Thiết lập email gửi hóa đơn](/cac-buoc-de-bat-dau-su-dung-phan-mem/1.9-tuy-chon/1.9.4-thiet-lap-email-gui-hoa-don.md)
{% endcontent-ref %}