Question

ex 4 Shi 5
Plizz dau coroana

Answer 1

4. a) x/2y + y/2y = (x + y)2y
    b) (m/2m+n)  + 1 = (m/2m+n) + (2m+n/2m+n) = (m + 2m + n)/2m+n =                    (3m+n/2m+n
   c) 3a²/(a² - 1) - a/9a = (3a² * 9a/9a(a²-1) - a(a² - 1)/9a(a²-1) =
       27a³ - a³ - a/9a(a²-1) = 26a³ - a/9a(a²-1) = 26a(a²- 1)/9a(a²-1) = 26/9
   d) (a + 2)/a - a/(a + 2) = (a + 2)² - a²/a(a + 2) = a² + 2a + 4 - a²/a(a + 2) =
       2(a + 2)/a(a + 2) = 2/a
5. a) 2/5x + 3/5x - 24/10x = 4/10x + 6/10x - 24/10x = - 14/10x = -7/5x
    b) (5x + 1)/2y + (7 - 3x)/2y - (4x - 1)/4y = 2(5x + 1)/4y + 2(7 - 3x)/4y -
        (4x - 1)/4y = (10x + 2 + 14 - 6x - 4x + 1)/4y =
        14/4y