Tolong jawab besok dikumpul ada yg tau jawaban latihan 2.5 buku paket kurikulum 2013 hal 72

langsung jawabannya yah !
1. 2x-4x+3y-5y
= -2x-2y
2.9x kuadrat +8x kuadrat + 7x kuadrat 3 - 5x kuadrat 3
= 17x kuadrat + 2x kuadrat 3
3.7a+7ab-3b-3ab
=7a+7ab-3ab-3b
= 7a+ 4ab-3b
4.-b( 3-x )
__________
-c(x-3)
-b(3-x)
_______
c(-x+3)
= -b
___
c
5.3(x-1)+3(x+1)
_____________
(x+1)(x-1)
=3x-3+3x+3
____________
x* -x+x-1
=6x
__
x*-1
sampai no.5 dlu yah