Răspuns:
Explicație pas cu pas:
a=23
b+c=9
a) ab+ac = a(b+c) = 23*9 = 207
b) ab+ac-48 = a(b+c)-48 = 23*9-48 = 159
c) 5a+3b+3 = 5*23+3b+3 = 3b+118
d) 9b+9c-3a = 9(b+c)-3*23 = 9*9-69 = 81-69 = 12
e) 23b+ac = 23b+23c = 23(b+c) = 23*9 = 207
f) 9a-236-23c = 9*23-236-23c = 207-236-23c = -29-23c