tolong dijawab beserta cara ya thanks

[tex] 1. \: \: \: \frac{36 \times 1}{9} = 4[/tex]
[tex] 2. \: \: \: \frac{3 \times 60}{5} \: \: \: 60 \div 5 =12 \\ = 3 \times 12 \\ = 36[/tex]
3. (1 x 65) : 10 = 6,5
4. (6 x 138) : 5 = 828 : 5 = 165,6
5. (4 x 80) : 9 = 320 :9 =35,55...