3又1/3×(-0.3)×(-1又1/4)×(-2又1/3)和-3/4×(4/9-2又2/3+12)

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3又1/3×(-0.3)×(-1又1/4)×(-2又1/3)和-3/4×(4/9-2又2/3+12)
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3又1/3×(-0.3)×(-1又1/4)×(-2又1/3)和-3/4×(4/9-2又2/3+12)
3又1/3×(-0.3)×(-1又1/4)×(-2又1/3)和-3/4×(4/9-2又2/3+12)

3又1/3×(-0.3)×(-1又1/4)×(-2又1/3)和-3/4×(4/9-2又2/3+12)
3又1/3×(-0.3)×(-1又1/4)×(-2又1/3) 负因数有三个,积为负
=-(10/3×3/10×5/4×7/3)
=-(1×5/4×7/3)
=-35/12
-3/4×(4/9-2又2/3+12)
=-3/4×4/9-3/4×(-2又2/3)-3/4 ×12
=-1/3 +3/4×8/3 -9
=-1/3 +2 -9
=-22/3

(1又1/4+2又5/6)÷(1又1/4×0.8-0.3)=(4+1/12)/(5/4*4/5-0.3)=(4+1/12)/0.7=49/12*10/7=35/6=5又5/6