dijawab Pls Nomer 1dan3 pakai caraa

[tex]18 = 2 \times3 \times 3 \\ 36 = 2 \times 2 \times3 \times3 \\ 54 = 2 \times 3 \times 3 \times 3 \\ fpb = 2 \times 3 \times 3 = 18[/tex]
ini soal nomer satu maaf kalo salah