Toán Lớp 9: Chứng minh (√a – 1) × (√a + 2) bằng a + √a – 2
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Toán Lớp 9: Chứng minh (√a – 1) × (√a + 2) bằng a + √a – 2
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\left( {\sqrt a – 1} \right)\left( {\sqrt a + 2} \right)\\
= \sqrt a .\sqrt a + 2\sqrt a – \sqrt a – 2\\
= a + \sqrt a – 2
\end{array}$