(-0.75)÷4/5÷(-0.3)
=(-3/4)÷4/5÷(-3/10)
=(-3/4)×5/4×(-10/3)
=3/4×5/4×10/3
=25/8
(-12.5)÷(7/6)÷(-1/4)
=(-25/2)×6/7×(-4)
=(25/2×6/7)×4
=300/7
(2又1/3-3又1/2+1又1/6)÷(-1又1/6)
=(7/3-7/2+7/6)÷(-7/6)
=(7/3-7/2+7/6)×(-6/7)
=7/3×(-6/7)-7/2×(-6/7)+7/6×(-6/7)
=-2+3-1
=0
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