1/3a+5/6a-1/2a выражение если а 1/4; 3/8; 9/16; 15/22

Упрощаем: a×(1/3+5/6-1/2) = a × (2+5-3)/6 = 4/6a = 2/3a

подставляем а:
1. 2/3×1/4 = 2/12 =1/6
2. 2/3×3/8=2/8 × 3/3=1/4
3. 2/3×9/16==2/16 × 3/9=1/8 × 1/3=1/24
4. 2/3×15/22=2/22 × 3/15=1/11 × 1/5=1/55