Tolong donk kerjaknkn no 1-7

1.
3b - bx / cx - 3c
= b(3 - x) / c(x - 3)
= -b (x - 3) / c(x - 3)
= -b/c

2.
Sama kayak no.1

3.
[ 3 / (x + 1) ] + [ 3 / (x - 1) ]
= [ 3 (x - 1) + 3 (x + 1) ] / [(x + 1)(x - 1)]
= [ 3x - 3 + 3x + 3 ] / (x² - 1)
= 6x / (x² - 1)

4.
[ x / (x + y) ] + [ y / (x - y) ]
= [ x (x - y) + y (x + y) ] / [(x + y)(x - y)]
= [ x² - xy + xy + y² ] / (x² - y²)
= (x² + y²) / x² + y²

5.
(4a / 3x) - (4 / 2x)
= 8ax - 12x / 6x²
= 2x (4a - 6) / 6x²
= (4a - 6) / x

6.
[ 2 / (x + 3) ] - [ 3 / (x - 2) ]
= [ 2 (x - 2) - 3 (x + 3) ] / (x + 3)(x - 2)
= [ 2x - 4 - 3x - 9 ] / x² + x - 6
= (-x - 13) / x² + x - 6
= - (x + 13) / x² + x - 6

7.
(3x / 2x) ((x - 4) / 6x)
= (3/2) ((x - 4) / 6x)
= (1/2) ((x - 4) / 2x)
= 1/4x (x - 4)
= 1/4x² - x

8.
(ab² / c) : (b / ac)
= (ab² / c) (ac / b)
= (ab ) (a )
= a²b