minta bantuannya yah kakak kakak brainly!!!!

jawab

1)
 x = (1/2 + 1/4) / (1/2. 1/4)
x = (1/2 + 1/4) / (1/8) ...kalikan 8
x = (4 + 2) /(1)
x = 6

2)
2/(3x - 4) - 1/20 =  5/(6x -8)
2/(3x - 4) - 5/(6x -8) = 1/20.....kalikan 20(3x-4)(6x-8)

2(20)(6x -8) - 5(20)(3x-4) = (3x-4)(6x -8)
40(6x - 8) - 100(3x - 4) = (3x - 4)(6x -8)
240x - 320 - 300x + 400 = 18 x² - 48 x + 32
80 - 60 x = 18 x² - 48x  + 32
18x² + 12x - 48 =0
3x² + 2x - 8 =0
(3x - 4)(x +2) = 0
x = 4/3  atau x =-2

3)
-2 |4 - x| = 1 - 5/2
-2 | 4 - x| = - 3/2
|4 - x| =  3/4

i)  4 - x = 3/4 
x= 4 - 3/4 = 3¹/₄

II) x - 4 = 3/4
x =  3/4 - 4
x = - 3¹/₄ 

HP x = - 3¹/₄  atau x = 3¹/₄