Ответ:

[tex]3.56 \times 3 \frac{1}{9 } - 1.56 \times 3 \frac{1}{9} = 3 \frac{1}{9} (3.56 - 1.56) = 3 \frac{1}{9} \times 2 = 6 \frac{2}{9} [/tex]