Question

1,(7)minus12supra25;1,2(1)×109 supra90

Answer 1

$1.(7) - \frac{12}{25} = 1 \times \frac{7}{9} - \frac{12}{25} = \frac{9}{16} - \frac{12}{25} = \frac{225}{400} - \frac{192}{400} = \frac{33}{400}$
$1.2(1) \times \frac{109}{90} = 1 \frac{19}{90} \times \frac{109}{90} = \frac{109}{90} \times \frac{109}{90} = \frac{11881}{8100}$