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3 jenis yang kutemukan :
misalnya :
8 adalah 3 darinya 5
4 adalah 3 darinya 1
misalnya :
11 akar kuadratnya dari 121
13 akar kuadratnya dari 169
misalnya :
4 adalah 2 kalinya 2
6 adalah 2 kalinya 3
f : x -> y <-> y = f(x)
keterangan : y = variabel terikat
x = variabel bebas
a. L = alas x tinggi / 2 (pakai rumus luas segitiga)
L = (a)(10x) / 2 = 5ax
Penulisan dalam notasi fungsi : L(a) = (5x)a atau f(a) = (5x)a
b. K = 2 (panjang + lebar) (rumus keliling persegi panjang, dengan lebar = x dan panjang = x + 2
K = = 2 (x + x + 2)
K = 4x + 4
Penulisan dalam notasi fungsi : K(x) = 4x + 4 atau f(x) = 4x + 4
Grafik sebagai suatu fungsi tidak boleh memiliki 2 nilai, cuma boleh 1 nilai
Contoh : Kolom A {1,2,3,4} tidak Kolom B {2,3,4,5}, harus Kolom A {1,2,3,4} betul kolom B {1}, atau Kolom A {1} betul Kolom B {1,2,3,4}, karena peraturannya hanya bisa satu angka dalam fungsi (Cartecius).
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