6又8/17×2/23+3/17×9/23 78÷78又78/79
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![6又8/17×2/23+3/17×9/23 78÷78又78/79](/uploads/image/z/110060-44-0.jpg?t=6%E5%8F%888%2F17%C3%972%2F23%2B3%2F17%C3%979%2F23+78%C3%B778%E5%8F%8878%2F79)
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6又8/17×2/23+3/17×9/23 78÷78又78/79
6又8/17×2/23+3/17×9/23 78÷78又78/79
6又8/17×2/23+3/17×9/23 78÷78又78/79
110/17×2/23+3/17×9/23
=(220+27)/(17*23)
=247/391
78÷(6240/79)
=78*79/6240
=0.9875
247/391
79/80