Verified answer

Пошаговое объяснение:

[tex]1) - 42 + 75 + ( - 14) + ( - 26) + 56 = 33 + ( - 14) + ( - 26) + 56 = 19 + ( - 26) + 56 = - 7 + 56 = 49[/tex]

[tex]2)12 + ( - 20) - ( - 11) - ( - 6) - 10 = 12 - 20 + 11 + 6 - 10 = - 8 + 11 + 6 - 10 = 3 + 6 - 10 = 9 - 10 = - 1[/tex]

[tex]3)352 - ( - 1 {}^{1} ) + ( - 43) = 352 + 1 - 43 = 353 - 43 = 310[/tex]