(-5)*(-3/6/7)+(-7)*(-3/6/7)+12*(-3/6/7) 两个//代表几又几分之几!
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![(-5)*(-3/6/7)+(-7)*(-3/6/7)+12*(-3/6/7) 两个//代表几又几分之几!](/uploads/image/z/450713-65-3.jpg?t=%28-5%29%2A%28-3%2F6%2F7%29%2B%28-7%29%2A%28-3%2F6%2F7%29%2B12%2A%28-3%2F6%2F7%29+%E4%B8%A4%E4%B8%AA%2F%2F%E4%BB%A3%E8%A1%A8%E5%87%A0%E5%8F%88%E5%87%A0%E5%88%86%E4%B9%8B%E5%87%A0%21)
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(-5)*(-3/6/7)+(-7)*(-3/6/7)+12*(-3/6/7) 两个//代表几又几分之几!
(-5)*(-3/6/7)+(-7)*(-3/6/7)+12*(-3/6/7) 两个//代表几又几分之几!
(-5)*(-3/6/7)+(-7)*(-3/6/7)+12*(-3/6/7) 两个//代表几又几分之几!
(-5)*(-3/6/7)+(-7)*(-3/6/7)+12*(-3/6/7)
=(-3/6/7)(-5-7+12)=(-3/6/7)*0=0