A= 45-85÷(-5)+4×6-13
A= 45-(-17)+4×6-13
A= 45+17+24-13
A= 62+24-13
A= 86-13
A= 73
B= (-8x6+(-20))÷(-4+8-16-4)÷4)
B= (-48-20)÷(4-16-4)÷4)
B= -68÷(-12-4)÷4)
B= -68÷(-16÷4)
B= -68÷(-4)
B= 17
C= (-18÷(7-9))×(5×(-6)-16-24÷4+43)
C= (-18÷(-2))×(5×(-6)-16-24÷4+43)
C= 9×(5×(-6)-16-24÷4+43)
C= 9×(-30-16-24÷4+43)
C= 9×(-30-16-6+43)
C= 9×(-46-6+43)
C= 9×(-52+43)
C= 9×(-9)
C= -18