[tex]2 \frac{1}{5} \div 1 \frac{1}{1} - 1 \frac{1}{4} = [/tex]

2 1/5 ÷ 1 1/1 - 1 1/4
( 11/5 ÷ 2/1 ) - 5/4
( 11/5 × 1/2 ) - 5/4
11/10 - 5/4
22/20 - 25/20 = - 3/20

Penyelesaian :
[tex]2 \frac{1}{5} \div 1 \frac{1}{1} - 1 \frac{1}{4} \\ = ( \frac{11}{5} \div \frac{2}{1} ) - \frac{5}{4} \\ = (\frac{11}{5} \times \frac{1}{2} ) - \frac{5}{4} \\ = \frac{11}{10} - \frac{5}{4} = \frac{22 - 25}{20} = - \: \frac{3}{20} [/tex]

- MathLovers♡
Good Luck :)