c)
375: {32 - [4+ (5.3² - 42)]} - 14
= 375 : {32 - [4+ (5.9-42)]} - 14
= 375 : {32 - [4+ (45-42)]} - 14
= 375 : 32 - (4 + 3) - 14
= 375: (32-7) – 14 
= 375: 25-14
= 15-14 = 1
= 1

c) 375: 32 - [4+ (5.3² - 42)] - 14 = 375 : 32 - [4+ (5.9-42)] - 14 = 375 : 32 - [4+ (45-42)] - 14 = 375 : 32 - (4 + 3) - 14 = 375: (32-7) – 14  = 375: 25-14 = 15-14 = 1 = 1

375 : {32 - [4 + (5.3² - 42)]} - 14
= 375 : {32 - [4 + (5.9 - 42)]} - 14
= 375 : {32 - [4 + (45 - 42)]} - 14
= 375 : [32 - (4 + 3)] - 14
= 375 : (32 - 7) - 14
= 375 : 25 - 14
= 15 - 14 
= 1
chúc bạn học tốt

375 : 32 - [4 + (5.3² - 42)] - 14 = 375 : 32 - [4 + (5.9 - 42)] - 14 = 375 : 32 - [4 + (45 - 42)] - 14 = 375 : [32 - (4 + 3)] - 14 = 375 : (32 - 7) - 14 = 375 : 25 - 14 = 15 - 14