(8-1又1/3-0.4)×(-3/4)

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(8-1又1/3-0.4)×(-3/4)

(8-1又1/3-0.4)×(-3/4)
(8-1又1/3-0.4)×(-3/4)

(8-1又1/3-0.4)×(-3/4)
(8-1又1/3-0.4)×(-3/4)
=(8-4/3-0.4)×(-3/4)
=-(120/15-20/15-6/15)×3/4
=-94/15×3/4
=-47/10
=-4.7

(8-1又1/3-0.4)×(-3/4)=(8-4/3-2/5)*(-3/4)=94/15*(-3/4)=-4.7

(8-1又1/3-0.4)×(-3/4)
= (6 又 2/3-0.4)×(-3/4)
=(6又4/15) )×(-3/4)
=(94/15)×(-3/4)
= -4.7

是原式=(4/3-2/3-2/5)×(-4/3)
=-8/15