minta tolong no.2 dongg Rules : dilarang ngasal/ngarang, dikerjakan menggunakan caranya! noted : Ini.... Question from @yxts

pengguna12385

Jawaban dan penjelasan sudah saya lampirkan pada dua foto di atas yaa..

Semoga membantu!

21 votes Thanks 21

yxts tanya gada yg peduli,padahal butuh

brownchoolate yaampun, di kumpulin besok kak pr nya?

yxts iyaaa yaampun

yxts mo nangiss rasanya

brownchoolate gimana cobaa

yxts capeee;(

pengguna12385 kak, ini eror ga bisa di edit, haduh

pengguna12385 bentar yaa..

brownchoolate kak itu ada jawaban baru

pengguna12385 kak, jawabannya sudah saya edit, sekali lagi mohon maaf sebesar-besarnya atas kekeliruan saya ya :)

DB45

Matriks INvers

misal roti coklat = x
roti keju = y
roti samir = y

matriks koefisien
3x+ y + 2z = 17.000
x+ 2y + z = 13.000
2x+ y + z = 12.000

$\sf \left[\begin{array}{ccc}3&1&2\\1&2&1\\2&1&1\end{array}\right]\left[\begin{array}{ccc}x\\y\\z\end{array}\right] = \left[\begin{array}{ccc}17.000\\13.000\\12.000\end{array}\right]$

$\sf \left[\begin{array}{ccc}x\\y\\z\end{array}\right] =\left[\begin{array}{ccc}3&1&2\\1&2&1\\2&1&1\end{array}\right]^{-1} \left[\begin{array}{ccc}17.000\\13.000\\12.000\end{array}\right]$

misalkan
$\sf A = \left[\begin{array}{ccc}3&1&2\\1&2&1\\2&1&1\end{array}\right]$

det A = 3{2(1) - 1(1)} - 1 {1(1)-1(2)}+ 2{1(1)-2(2)}
det A= 3(1) - 1(-1) + 2(-3)
det A = 3 + 1 - 6
det A = 2

$\sf Adj A = \left[\begin{array}{ccc}1&1&-3\\1&-1&-1\\3&-1&5\end{array}\right]$

$\sf A^{-1} = \frac{1}{det \ A} [ adj A]$

maka

$\sf \left[\begin{array}{ccc}x\\y\\z\end{array}\right] =-\frac{1}{2}\left[\begin{array}{ccc}1&1&-3\\1&-1&-1\\-3&-1&5\end{array}\right] \left[\begin{array}{ccc}17.000\\13.000\\12.000\end{array}\right]$

$\sf \left[\begin{array}{ccc}x\\y\\z\end{array}\right] =-\frac{1}{2}\left[\begin{array}{ccc} -6.000\\-8.000\\-4.000\end{array}\right]$

$\sf \left[\begin{array}{ccc}x\\y\\z\end{array}\right] =\left[\begin{array}{ccc} 3000\\4.000\\2.000\end{array}\right]$

maka harga
1 roti coklat = x = 3.000
1 roti keju = y = 4.000
1 roti semir = z = 2.000

2 votes Thanks 1

Recommend Questions

Life Enjoy

Get in touch

Social