Question

Tolong dong no 2, 4, 6, 8, 10

Answer 1

2)

(3b - bx) / (cx - 3c)
= b (3-x) / c (x-3)
= -b (3-x) / -c (x-3)
= -b (3-x) / c (-x+3)
= -b (3-x) / c (3-x)
= -b/c

4)

x / ( x+y ) + y / ( x-y )
= x ( x-y ) + y ( x+y ) / ( x+y )( x-y ) //kali silang//
= x^2 -xy + xy + y^2 / x^2 - y^2 //kalikan//
= x2 + y2 / x2 - y2 //jumlah -xy +xy //
**pangkat 2

6)

sama, dikali silang

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

**pangkat

8)

( ab2 / c ) / ( b / ac )
= ( ab2 / c ) * ( ac / b )
= a2b

**pangkat

10)

x2 + y2 / x + y
––––––––––
( x / y ) + ( y / x)

= (x+y)(x+y) - 2xy / (x+y)
. –––––––––––––––
. xy + xy / xy

= x + y - 2xy
. ––––––––
. 2xy / xy

= x + y - 2xy
. ––––––––
. 2

= (x + y -2xy) / 2