(-0.3)×(-0.8)×12分之5×0.24×(-100)
=0.24×5/12×24
=1.2×2
=2.4
(-66)×(1又1/2+1/3-5/11)
=(-66)×3/2+(-66)×1/3-(-66)×5/11
=-33×3-22+30
=-99+8
=-91