Question

1/4 a^2-9/25 đáp án +cách giải

Answer 1

\(\dfrac{1}{4}a^2-\dfrac{9}{25}=\left(\dfrac{1}{2}a-\dfrac{3}{5}\right)\left(\dfrac{1}{2}a+\dfrac{3}{5}\right)\)

Answer 2

\(\dfrac{1}{4}a^2-\dfrac{9}{25}\)

\(=\left(\dfrac{1}{2}a\right)^2-\left(\dfrac{3}{5}\right)^2\)

\(=\left(\dfrac{1}{2}a+\dfrac{3}{5}\right)\left(\dfrac{1}{2}a-\dfrac{3}{5}\right)\)

(Áp dụng hằng đẳng thức số 3)

Answer 3

=(a/2)^2 -(3/5)^2

=(a/2 +3/5).(a/2 -3/5)