расставить скобки: 48:4+8*7-5=28 ; 48:4+8*7-5=23. ; 48:4+8*7=135. ; 48:4+8*7-5=8. ; 48:4+8*7-5=40

Решение:

48 : 4 + 8 * (7 - 5) = 12 + 8 * 2 = 12 + 16 = 28  

48 : (4 + 8) * 7 - 5 = 48 : 12 * 7 - 5 = 23

(48 : 4 + 8) * 7 - 5 = (12 + 8) * 7 - 5 = 20 * 7 - 5 = 140 - 5 = 135

48 : (4 + 8) * (7 - 5) = 48 : 12 * 2 = 4 * 2 = 8  

(48 : 4 + 8) * (7 - 5) = (12 + 8) * 2 = 20 * 2 = 40