这四道题的详细过程。谢谢。
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5/6 ×1/7+1/6×1/7
=(5/6+1/6)×1/7
=1×1/7
=1/7
3/4 ×1/腔渗5 ×4
=3/20 ×4
=3/5
87 ×3/86
=(86+1)×3/86
=3+3/86
=3又3/86
1/11 ×2/9+2/11 ×4/9 +6/11×2/9
= 1/11 ×2/9+4/11 ×2/9 +6/运圆颂11×2/9
=(1/11+4/11+6/11)×2/9
=11/11 ×2/旁郑9
=2/9
=(5/6+1/6)×1/7
=1×1/7
=1/7
3/4 ×1/腔渗5 ×4
=3/20 ×4
=3/5
87 ×3/86
=(86+1)×3/86
=3+3/86
=3又3/86
1/11 ×2/9+2/11 ×4/9 +6/11×2/9
= 1/11 ×2/9+4/11 ×2/9 +6/运圆颂11×2/9
=(1/11+4/11+6/11)×2/9
=11/11 ×2/旁郑9
=2/9
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