\[\boxed{\mathbf{288}.\ }\]
\[1)\ (238 - 149) + 506 =\]
\[= 89 + 506 = 595\]
\[2)\ (48 + 16)\ :(48 - 16) =\]
\[= 64\ :32 = 2\]
\[3)\ (124 + 126) \cdot (313 - 307) =\]
\[= 250 \cdot 6 = 1500\]
\[4)\ 32 \cdot 15 - 896\ :28 =\]
\[= 480 - 32 = 448\]