1 7/8 + 2 5/16 = 15/8 + 37/16 =(15 × 2 + 37 × 1)/16 = 30/16 + 37/16 = 67/16 = 4 3/168 - 5/12 =8/1-5/12=<span>(8 × 12 - 5 × 1)/12 = 96/12 - 5/12 = 91/12 = 7 7/12
</span>4 - 1 2/3 = 4/1 - 5/3 =<span>(4 × 3 - 5 × 1)/3 = 12/3 - 5/3 = 7/3 = 2 1/3</span>
<span>9100000000 вот так это легко</span>
30(учеников)-100%
12(уч)-Х%
Сост. ур-е.
30·Х=100·12
30·Х=1200
Х=1200:30
Х=40_______
Корень