kaka bantu no 16-17 nya
Matematika
ilham45333331
Pertanyaan
kaka bantu no 16-17 nya
1 Jawaban
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1. Jawaban whongaliem
16) y = (3x - 4) / (2x + 5)
y (2x + 5) = 3x - 4
2xy + 5y = 3x - 4
2xy - 3x = - 5y - 4
x (2y - 3) = - 5y - 4
x = (- 5y - 4) / (2y - 3)
f^-1 (x) = (- 5x - 4) / (2x - 3) ; x ≠ 3/2 .... jawaban :D
17) banyak pilihan = 4C2 x 7C2
= 4! /2! .(4 - 2)! x 7! /2! (7 - 2)!
= 4.3.2! / 2 .2! x 7.6.5! / 2 . 5!
= 4. 3 / 2 x 7 .6 / 2
= 6 x 21
= 126