Jawab:
[tex](1.)~~=-1\frac{2}{3}\\\\(2.)~~=\frac{1}{8}[/tex]
(3.) = 6(4.) = -30
Penjelasan dengan langkah-langkah:
[tex](1.)~~\frac{15}{-9}=-\frac{15}{9}=-\frac{15\div3}{9\div3}=-\frac{5}{3}\\=-(\frac{3+2}{3})=-(\frac{3}{3}+\frac{2}{3})=-(1+\frac{2}{3})\\=-1\frac{2}{3}\\\\(2.)~~-\frac{5}{8}-(-\frac{3}{4})=-\frac{5}{8}+\frac{3}{4}\\=\frac{3}{4}-\frac{5}{8}=\frac{3\times2}{4\times2}-\frac{5}{8}=\frac{6}{8}-\frac{5}{8}\\=\frac{1}{8}[/tex]
(3.) 18 ÷ (-6) × (-2)= 18 × (-2) ÷ (-6)= 18 × (2 ÷ 6)= 18 × (1 ÷ 3)= 18 ÷ 3= 6
[tex](4.)~~5\times(-4)\div\frac{2}{3}\\=-(5\times4\times\frac{3}{2})\\=-(20\times\frac{3}{2})\\=-(\frac{20}{2}\times3)[/tex]= -(10 × 3)= -30
(xcvi)