Ответ:\(42+19=61\)\(3\cdot7=21\)\(99-66=33\)\(3\cdot9=27\)\(27+48=75\)\(16:2=8\)\(31+19=50\)\(21:3=7\)Ответ: 61; 21; 33; 27; 75; 8; 50; 7.