PLS HELPPPPP ex 5 DAU COROANĂ

5. a = 39; b + c = 36
a) a + b + c = 39 + 36 = 75.
b) 3a + b + c = 3 · 39 + 36 = 153.
c) a - (b + c) = 39 - 36 = 3.
d) a + 2b + 2c = a + 2 · (b + c) = 39 + 2 · 36 = 111.
e) a + 3b + 3c = a + 3 · (b + c) = 39 + 3 · 36 = 147.
/rfd