$$40/9+90 \times 4+70-40/10-40$$
$\frac{3514}{9}\approx 390.444444444$
$$\frac{40}{9}+360+70-\frac{40}{10}-40$$
$$\frac{40}{9}+\frac{3240}{9}+70-\frac{40}{10}-40$$
$$\frac{40+3240}{9}+70-\frac{40}{10}-40$$
$$\frac{3280}{9}+70-\frac{40}{10}-40$$
$$\frac{3280}{9}+\frac{630}{9}-\frac{40}{10}-40$$
$$\frac{3280+630}{9}-\frac{40}{10}-40$$
$$\frac{3910}{9}-\frac{40}{10}-40$$
$$\frac{3910}{9}-4-40$$
$$\frac{3910}{9}-\frac{36}{9}-40$$
$$\frac{3910-36}{9}-40$$
$$\frac{3874}{9}-40$$
$$\frac{3874}{9}-\frac{360}{9}$$
$$\frac{3874-360}{9}$$
$$\frac{3514}{9}$$
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$\frac{2 \cdot 7 \cdot 251}{3 ^ {2}} = 390\frac{4}{9} = 390.44444444444446$
