Tính

a, \(\left(\dfrac{1}{2}x^2-\dfrac{1}{3}y\right)\left(\dfrac{1}{4}x^4+\dfrac{1}{6}x^2y+\dfrac{1}{9}y^2\right)\)

Tính nhanh

1, 126² - 152 * 126 + 5776

2, 3⁸ * 5⁸ - (15⁴ - 1)(15⁴ + 1)

Tính

(x + 1)² - 10(x + 1) + 25

Tính

a, (2x - 3)²

b, (x + 1)²

c, (2x + 5)(2x - 5)

d, (a + b - c)(a - b + c)

e, (x + 1)² - 10(x + 1) + 25