Michellee04
kalo michelle td sblm dikerjain spy ga bingung (hahahhaa. cari gampang aja jg msh bingung) yg kaya 3b ato yg sejenis dikerjain dl sblm dimasukin ke soal (terpisah) nah malah bingung jg nempatin dimana positif negatifnya.. hehehehe.. yg no 3 kalo model nya bgtu pasti jd minus ya..? dsni michelle nulisnya + 4 bkn - 4. ok ok saya paham.. makasih yaa..
= (2p -3r) + (-7r +4) + (8p +6r -12)
= 2p +8p -3r -7r +6r +4 -12
= 10p -4r -8
2) a - 2b - 2c
= (2p -3r) - 2(-7r +4) - 2(8p +6r -12)
= 2p -3r +14r -8 -16p -12r +24
= 2p -16p -3r +14r -12r -8 +24
= -14p -r +16
3) 2a - b + 2c
= 2(2p -3r) - (-7r +4) + 2(8p +6r -12)
= 4p -6r +7r -4 +16p +12r -24
= 4p +16p -6r +7r +12r -4 -24
= 20p +13r -28
4) -4a + 3b - c
= -4(2p -3r) + 3(-7r +4) - (8p +6r -12)
= -8p +12r -21r +12 -8p -6r +12
= -8p -8p +12r -21r -6r +12 +12
= -16p -15r +24
nomer 1 udah bner
2. a - 2b -2c = 2p - 3r -2(-7r +4) - 2(8p +6r -12)
= 2p - 3r + 14r -8 -16p -12r + 24
= -14p - r + 16
3. 2a - b + 2c = 2(2p -3r) -(-7r+4) +2(8p + 6r -12)
= 4p -6r +7r -4 +16p +12r -24
= 20p +13r -28
4. -4a + 3b -c = -4(2p-3r) +3(-7r +4) -(8p+6r-12)
= -8p+12r-21r+12-8p-6r+12
= -16p -15r +24