Ответ:

[tex] \frac{1}{4}100 = 25 [/tex]

[tex] \frac{1}{4} 120 = 30[/tex]

[tex] \frac{1}{4} 320 = 80[/tex]

[tex] \frac{9}{10} 170 = 153[/tex]

[tex] \frac{9}{10} 150 = 135[/tex]

[tex] \frac{9}{10} 1200 = 1080[/tex]