\(\boxed{\mathbf{43.}}\)
\[\textbf{а)}\ 38 + (11 - 9) = 38 + 2 = 40\]
\[46 - (8 + 3) = 46 - 11 = 35\]
\[95 + (12 - 7) = 95 + 5 = 100\]
\[\textbf{б)}\ 54 + (12 - 6) = 54 + 6 = 60\]
\[(17 - 9) + 62 = 8 + 62 = 70\]
\[79 - (8 + 8) = 79 - 16 = 63\]
\[87 - (14 - 8) = 87 - 6 = 81\]
\[(6 + 9) + 85 = 15 + 85 = 100\]
\[92 + (15 - 7) = 92 + 8 = 100\]