(1)6+(- 5分之1)-2-(1.5)
=6-0.2-2-1.5
=5.8-2-1.5
=3.8-1.5
=2.3
(2)-66*4-(-2.5)/(-0.1)
=-264-25
=-289
(3)(-2的平方)*5-(-2的平方)/4
=-4×5-(-4)/4
=-20-(-1)
=-20+1
=-19