1000×(1/100-1/1000)
= 1000×1/100-1000×1/1000
=10-1
=9
(16.5×5+7.5×5)÷6
= (16.5+7.5)×5÷6
=24÷6×5
=20
(-3)*2÷(-1/3)
=9×(-3)
=-27
(-5)÷(-15)÷(-3)
=1/3×(-1/3)
=-1/9
-1+5÷(-1/6)×(-6)
=-1+5×6×6
=-1+180
=179
-1*9-1/6×(10-(-4)*2)
=-1-1/6×(10-16)
=-1+1/6×6
=-1+1
=0