Ответ:\(397+71=468\);\(234+297=531\);\(756-89=667\);\(345+174=519\);\(786-457=329\);\(434-343=91\);\(1067-349=718\);\(1058-78=980\);\(2345+8769=11114\);\(8769-2345=6424\);\(76549+98765=175314\);\(234567-7896=226671\).