[1/3-(-1/9)+5/12]×(-36) 19又15/16×(-8) (1又1/2)×(-1又1/3)×(-1又1/4)×1又1/5)×(-1又1/6)×(-1又1/7)

[1/3-(-1/9)+5/12]×(-36) 19又15/16×(-8) (1又1/2)×(-1又1/3)×(-1又1/4)×1又1/5)×(-1又1/6)×(-1又1/7)

[1/3-(-1/9)+5/12]×(-36)=[1/3+1/9+5/12]x(-36)=(12+4+15)/36x(-36)=31/36x(-36)=-31
19又15/16×(-8)=(19x16+15)/16x(-8)=-319/2=-159又1/2
(1又1/2)×(-1又1/3)×(-1又1/4)×1又1/5)×(-1又1/6)×(-1又1/7)
=3/2x4/3x5/4x6/5x7/6x8/7=4