Lời giải:
Áp dụng định lí Pitago ta có:
Áp dụng định lí 3 ta có:
Bài 2 trang 68 - Tính
Bài 4 trang 69 - Tính
I'm David Smith, husband and father , I love Photography,travel and nature. I'm working as a writer and blogger with experience of 5 years until now.
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