Tolong bantu jawab ,!! Pake cara.

1. a. 5u^2y - 3 uy^2 - 7u^2y + 6uy^2 = -2u^2y + 3uy^2
    b. 3a - 5b - a - 4b = 2a - 9b
2. a. 4u + 5y - 8z (+) u - 2y - 3z = 5u + 3y - 11z
    b. 3u^2 + 4u - 2 (+) u^2 - 6u + 8 = 4u^2 - 2u + 6
3. a. - 2u + 3y (-) 2u + 3y = 2u + 3y (-) -2u + 3y = 4u 
    b. 5 (y-2) (-) 7 (y+1) = 5y - 10 (-) 7y + 1 = 7y + 1 (-) 5y - 10 = 2y + 11
4. a. 2u^3 - 3u - 9 : (u+3) = 2u^2 - 3
    b. 12u^2 - 7uy - 12 y^2 : (4u+3y) = 3u - 4y
5. a. 2/u-1 - 3/u+2 = 2u + 4 - 3u - 3/(U-1)(U+2) = -u + 1/(U+1)(U+2)
    b. u/2 + u+2/4 = 4u + 2u + 4/ 8 = 6u + 4/8
    c. u^2-u-6/6u-3 : 2u-6/4u-2
= (u+2)(u-3)/2(2u-1) 2(2u+1) : (u-3)(u+3)/ (2u-1)(2u+1)
= (u+2)(u-3)/ 2 (2u-1) 2 (2u+1) x (2u-1)(2u+1)/ (u-3)(u+3) = u+2/2.2. (u-3) 
    d. a+2/5a x 2a/2 = 2a + 4  10a^2