(-1/12)÷(1/4-1/6+1/2-1)/还有 (-1.25)*1又1/7*(-2.5)*(-7/8) (-8)*(-7.2)*(-2.5)*5/12
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![(-1/12)÷(1/4-1/6+1/2-1)/还有 (-1.25)*1又1/7*(-2.5)*(-7/8) (-8)*(-7.2)*(-2.5)*5/12](/uploads/image/z/12522162-66-2.jpg?t=%EF%BC%88-1%2F12%29%C3%B7%EF%BC%881%2F4-1%2F6%2B1%2F2-1%29%2F%E8%BF%98%E6%9C%89+%EF%BC%88-1.25%29%2A1%E5%8F%881%2F7%2A%EF%BC%88-2.5%29%2A%EF%BC%88-7%2F8%EF%BC%89+%28-8%29%2A%28-7.2%EF%BC%89%2A%EF%BC%88-2.5%29%2A5%2F12)
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(-1/12)÷(1/4-1/6+1/2-1)/还有 (-1.25)*1又1/7*(-2.5)*(-7/8) (-8)*(-7.2)*(-2.5)*5/12
(-1/12)÷(1/4-1/6+1/2-1)
/还有 (-1.25)*1又1/7*(-2.5)*(-7/8) (-8)*(-7.2)*(-2.5)*5/12
(-1/12)÷(1/4-1/6+1/2-1)/还有 (-1.25)*1又1/7*(-2.5)*(-7/8) (-8)*(-7.2)*(-2.5)*5/12
(1)
原式 = - 1/12 ÷ (3/12-2/12+6/12-12/12)
= - 1/12 ÷ (-5/12)
= 1/12×12/5
= 1/5
还有的
1.25……
= -5/4*8/7*(-5/2)-7/8
= 25/8
(-8)……
= -8*7.2*2.5*5/12
= -8*0.6*2.5*5
= -60
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