"Together we can do everything.
"
 | Giới Thiệu Phép trừ Nội dung chính: Phép trừ |
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[linkxem]https://docs.google.com/presentation/d/1h82jO-LpTWyENqcA0QI4F25PlxuFo4r_//preview[/linkxem]
[linktai]https://docs.google.com/presentation/d/1h82jO-LpTWyENqcA0QI4F25PlxuFo4r_//view[/linktai]