(3584*90/30+267*825)/3=75842, (3)
1)90/30=3 2)3584*3=7252 3)267*825=220275
4)7252+220275=227527 5)227527/3=75842, (3)
23х-19х+5х=1827
9х=1827
х=1827:9
х=203
проверка
23•203-19•203+5•203=1827
1827=1827
5х+3х-47=6401
8х=6401+47
8х=6448
х=6448:8
х=806
проверка
5•806+3•806-47=6401
6401=6401
161-(469,7:15,4+9,52)*15=-439,3