11. Efectuati:
a) 192-152 -112
b) 22 +39 +42 +52
그대
c) 27:32 -26:32
d) 52 - 42 - 32
e) (4+3)2 - 42-32
A 19-22. [4.9:(3-2)]
.
B. (62-7.5)​