Medium Arithmetic Puzzles

#1749: 4 _ 3 _ 9 _ 2 = 10 medium #1752: 4 _ 3 _ 9 _ 4 = 8 medium #1755: 4 _ 3 _ 9 _ 5 = 7 medium #1761: 4 _ 4 _ 2 _ 5 = 14 medium #1766: 4 _ 4 _ 2 _ 2 = 17 medium #1770: 4 _ 4 _ 2 _ 6 = 14 medium #1776: 4 _ 4 _ 2 _ 6 = 13 medium #1781: 4 _ 4 _ 3 _ 6 = 12 medium #1799: 4 _ 4 _ 5 _ 2 = 14 medium #1800: 4 _ 4 _ 5 _ 5 = 17 medium #1801: 4 _ 4 _ 5 _ 5 = 15 medium #1804: 4 _ 4 _ 6 _ 3 = 12 medium #1806: 4 _ 4 _ 6 _ 9 = 10 medium #1811: 4 _ 4 _ 6 _ 3 = 14 medium #1812: 4 _ 4 _ 6 _ 6 = 15 medium #1813: 4 _ 4 _ 6 _ 8 = 12 medium #1817: 4 _ 4 _ 7 _ 8 = 14 medium #1831: 4 _ 4 _ 8 _ 6 = 8 medium #1832: 4 _ 4 _ 8 _ 6 = -4 medium #1833: 4 _ 4 _ 8 _ 6 = 12 medium #1834: 4 _ 4 _ 8 _ 7 = -5 medium #1835: 4 _ 4 _ 8 _ 7 = 14 medium #1836: 4 _ 4 _ 8 _ 8 = 10 medium #1837: 4 _ 4 _ 8 _ 8 = -6 medium #1842: 4 _ 4 _ 9 _ 6 = 10 medium #1854: 4 _ 5 _ 2 _ 5 = 15 medium #1862: 4 _ 5 _ 3 _ 6 = 14 medium #1869: 4 _ 5 _ 4 _ 8 = -6 medium #1875: 4 _ 5 _ 6 _ 3 = 14 medium #1878: 4 _ 5 _ 6 _ 8 = 15 medium #1882: 4 _ 5 _ 8 _ 4 = -6 medium #1887: 4 _ 5 _ 8 _ 6 = 15 medium #1896: 4 _ 6 _ 2 _ 9 = 12 medium #1898: 4 _ 6 _ 3 _ 2 = 13 medium #1899: 4 _ 6 _ 3 _ 9 = 6 medium #1900: 4 _ 6 _ 3 _ 5 = 14 medium #1912: 4 _ 6 _ 3 _ 6 = 14 medium #1924: 4 _ 6 _ 4 _ 6 = 13 medium #1931: 4 _ 6 _ 4 _ 3 = 18 medium #1934: 4 _ 6 _ 5 _ 3 = 14 medium #1936: 4 _ 6 _ 5 _ 8 = 15 medium #1938: 4 _ 6 _ 6 _ 4 = 13 medium #1939: 4 _ 6 _ 6 _ 9 = 8 medium #1953: 4 _ 6 _ 8 _ 5 = 8 medium #1955: 4 _ 6 _ 8 _ 5 = 15 medium #1956: 4 _ 6 _ 8 _ 6 = 9 medium #1959: 4 _ 6 _ 8 _ 7 = 10 medium #1960: 4 _ 6 _ 8 _ 7 = -4 medium