(-3/2)*(+1又1/3)*(-1-1/4) (-3/2)*(+1又1/3)*(-1-1/4)
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(-3/2)*(+1又1/3)*(-1-1/4)(-3/2)*(+1又1/3)*(-1-1/4)(-3/2)*(+1又1/3)*(-1-1/4)(-3/2)*(+1又1/3)*(-1-1/4)(-3/
(-3/2)*(+1又1/3)*(-1-1/4) (-3/2)*(+1又1/3)*(-1-1/4)
(-3/2)*(+1又1/3)*(-1-1/4)
(-3/2)*(+1又1/3)*(-1-1/4)
(-3/2)*(+1又1/3)*(-1-1/4) (-3/2)*(+1又1/3)*(-1-1/4)
(-3/2)*(+1又1/3)*(-1-1/4)
=(-3/2)*(4/3)*(-5/4)
=5/2
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=(-3/2)*4/3*(-5/4)=-2*(-5/4)=5/2
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3又1/4+(-2又3/5)+5又3/4+(-8又2/5)要有过程