Х + (6534+241)=(4173+6534)+241х+6775=10707+241х+6775=10948х=10948-6775=4173Проверка:4173+(6534+241)=(471+6534)+2414173+6775=10707+24110948=10948
Х * (25*37)=(42*25)*37925х=38850х=38850:925х=42проверка:42 * (25*37)=(42*25)*3738850=38850
Х + 25689=25689+37541Х + 25689=63230х=63230-25689х=37541проверка:37541+25689=63230
6598*Х=2379*65986598х=15696642х=15696642:6598х=2379проверка: 6598*2379=15696642
(704:x)*2=1935-1759
(704:x)*2=176
1408:2x=176
2x=1408:176
2x=8
x=8:4
x=2
(50+7)-20=(50-20)+7=30+7=37
(70+5)-50=(70-50)+5=20+5=25
(80+9)-30=(80-30)+9=50+9=59
(40+5)-10=(40-10)+5=30+5=35
(90+8)-70=(90-70)+8=20+8=28
(50+3)-40=(50-40)+3=10+3=13