1. Calculate the expression with mixed numbers

$895231755 \frac{234}{357118} \cdot 895231754 \frac{234}{357118}-895231756 \frac{234}{357118} \cdot 895231753 \frac{234}{357118}$
Solution. If we set $a=895231755 \frac{234}{357118}$, then the expression to be calculated can be written in the following way:

$$
a(a-1)-(a+1)(a-2)=a^{2}-a-\left(a^{2}-2 a+a-2\right)=2
$$

so the result we are looking for is 2.