【4又2/3(-5/14)+(-0.4)/(-4/25)】1又1/5

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【4又2/3*(-5/14)+(-0.4)/(-4/25)】*1又1/5【4又2/3*(-5/14)+(-0.4)/(-4/25)】*1又1/5【4又2/3*(-5/14)+(-0.4)/(-4/25

【4又2/3*(-5/14)+(-0.4)/(-4/25)】*1又1/5
【4又2/3*(-5/14)+(-0.4)/(-4/25)】*1又1/5

【4又2/3*(-5/14)+(-0.4)/(-4/25)】*1又1/5
【4又2/3*(-5/14)+(-0.4)/(-4/25)】*1又1/5
=【-5/3+5/2】*1又1/5
=5/6×6/5
=1