There are many solutions, Nataszaa.
#56 (x-4/7)^7
I will solve this one, okay?
Substitute x.
$${\mathtt{x}} = {\mathtt{2}}$$
In this case, $${\mathtt{x}} = {\mathtt{2}}$$.
Now, turn 2 into a fraction.
$${\mathtt{2}} = {\frac{{\mathtt{2}}}{{\mathtt{1}}}}$$
Now, subtract.
$${\frac{{\mathtt{2}}}{{\mathtt{1}}}}{\mathtt{\,-\,}}{\frac{{\mathtt{4}}}{{\mathtt{7}}}} = {\frac{{\mathtt{10}}}{{\mathtt{7}}}}$$
But now, turn $${\frac{{\mathtt{10}}}{{\mathtt{7}}}}$$ into a whole number.
$${\frac{{\mathtt{10}}}{{\mathtt{7}}}} = {\mathtt{1.428\: \!571\: \!428\: \!571\: \!428\: \!6}}$$
Now, that you have the whole number, round it to the nearest tenths.
$${\mathtt{1.428\: \!571\: \!428\: \!571\: \!428\: \!6}} = {\mathtt{1.4}}$$
Now, do the exponent $${{\mathtt{1.4}}}^{{\mathtt{7}}}$$.
$${{\mathtt{1.4}}}^{{\mathtt{7}}} = {\mathtt{10.541\: \!350\: \!4}}$$.
That's your answer.