Question

a=546+304-(560:7x3+10x27)

Answer 1

A =850-(80*3+270)
A=850-(240+270)
A=850-510
A=340

Answer 2

$546+304-(560:7 \cdot 3+10 \cdot27)= \\ =546+304-(80 \cdot 3+10 \cdot 27) = \\ =546+304-(80 \cdot 3+270) = \\ =546+304-(240+270) = \\ = 546+304-510= \\ =850 -510 = \\ =\boxed{340}.$