Question

efectuati calculele

a. y supra 4 minus 5y supra 4
b. y supra y minus 2 minus 2 supra y minus 2
c. -2y supra y patrat plus 4 minus 6 minus 2y supra y patrat plus 4

Answer 1

Explicație pas cu pas:

a)

$\dfrac{y}{4} - \dfrac{5y}{4} = \dfrac{y - 5y}{4} = - \dfrac{4y}{4} = - y$

b)

y ≠ 2

$\dfrac{y}{y - 2} - \dfrac{2}{y - 2} = \dfrac{y - 2}{y - 2} = 1$

c)

$- \dfrac{2y}{ {y}^{2} + 4} - \dfrac{6 - 2y}{ {y}^{2} + 4} = \dfrac{ - 2y - (6 - 2y)}{ {y}^{2} + 4} = \dfrac{ - 2y - 6 + 2y}{ {y}^{2} + 4} = - \dfrac{6}{ {y}^{2} + 4}$