Jawabanmu

2014-02-25T05:54:28+07:00
x-3y=9  ......................... (x=9+3y)

5x+2y=11
5(9+3y)+2y=11
45+15y +2y=11
17y = 11-45
17y = (-34)
y = (-2)

x = 9+3y
x = 9 +3 x (-2)
x = 9 + (-6)
x = 3
---------------------------------------------------------------------------
= 0,875 : 1 1/4
= 875/1000 : 5/4
=
875/1000 x 4/5
= 3500/5000
= 35/50
= 7/10
= 0,7
---------------------------------------------------------------------------
=ab
=(3^-2) x ((1/6)^-2)
= 1/(3²) x 6²
= 1/9 x 36
= 4

jadikan jawaban terbaik ya :D