(258 + 693): 3 (185+590): 5 (455 + 189): 7 (378 +534): 6

To solve these arithmetic expressions, you need to perform the operations inside the parentheses first, and then divide the result by the number outside the parentheses. Here are the solutions:

(258 + 693): 3 = (951) / 3 = 317

(185+590): 5 = (775) / 5 = 155

(455 + 189): 7 = (644) / 7 = 92

(378 + 534): 6 = (912) / 6 = 152