1) (х - 16) : 9 = 126 2) 28 : (х + 5) = 224 3) (х + 76) : 7 = 15
х - 16 = 126 · 9 х + 5 = 28 : 224 х + 76 = 15 · 7
х - 16 = 1134 х + 5 = 0,125 х + 76 = 105
х = 1134 + 16 х = 0,125 - 5 х = 105 - 76
х = 1150 х = - 4,875 х = 29
Проверка:
1) (1150 - 16) : 9 = 126 2) 28 : (5 - 4,875) = 224 3) (29 + 76) : 7 = 15
1134 : 9 = 126 28 : 0,125 = 224 105 : 7 = 15
126 = 126 224 = 224 15 = 15
1) 3 1/4+2 1/6= 5 5/12
2) 5 1/6:31= 1/6
3) 5 5/12:2 3/5= 2 1/12
4) 2/3:4/9= 1 1/2
5) 1/6+2 1/12= 2 1/4
6) 2 1/4 - 1 1/2= 3/4
2. (6 4/7:5 3/4*7/16+9 1/2):2 1/2= 3 17/20
1) 6 4/7:5 3/4= 1 1/7
2) 1 1/7*7/16= 1/8
3) 1/8+9 1/2= 9 5/8
4) 9 5/8:2 1/2= 3 17/20