(1)1+5/6-19/12 (2)3*(-9)+7*(-9) (3)(4/5-6/7)*(-8/7)(4)(-54)÷6÷(-3)
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![(1)1+5/6-19/12 (2)3*(-9)+7*(-9) (3)(4/5-6/7)*(-8/7)(4)(-54)÷6÷(-3)](/uploads/image/z/116858-2-8.jpg?t=%EF%BC%881%EF%BC%891%2B5%2F6-19%2F12+%EF%BC%882%EF%BC%893%2A%EF%BC%88-9%EF%BC%89%2B7%2A%EF%BC%88-9%EF%BC%89+%EF%BC%883%EF%BC%89%EF%BC%884%2F5-6%2F7%EF%BC%89%2A%EF%BC%88-8%2F7%EF%BC%89%EF%BC%884%EF%BC%89%EF%BC%88-54%EF%BC%89%C3%B76%C3%B7%EF%BC%88-3%EF%BC%89)
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(1)1+5/6-19/12 (2)3*(-9)+7*(-9) (3)(4/5-6/7)*(-8/7)(4)(-54)÷6÷(-3)
(1)1+5/6-19/12 (2)3*(-9)+7*(-9) (3)(4/5-6/7)*(-8/7)(4)(-54)÷6÷(-3)
(1)1+5/6-19/12 (2)3*(-9)+7*(-9) (3)(4/5-6/7)*(-8/7)(4)(-54)÷6÷(-3)
(1)1+5/6-19/12
=22/12-19/12
=3/12=1/4
(2)3*(-9)+7*(-9)
=(3+7)*(-9)
=10*-9=-90
(3)(4/5-6/7)*(-8/7)
=(28/35-30/35)*(-8/7)
=-2/35*-8/7
=16/245
(4)(-54)÷6÷(-3)
=-9/-3
=3