Lời giải:
Áp dụng định lí (2) ta có:
22 = 1 . x ⇒ x = 22 = 4.
Áp dụng định lí (1) ta có:
y2 = x. (x + 1)
=> y2 = 4.(4 + 1) = 20
=> y = 20 = 25.
Bài 3 trang 69 - Tính
Bài 5 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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