这几道简便运算怎么做
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19×17/18
=（18+1）×17/18
=18×17/18+1×17/18
=17+17/18
=17又17/18
（1/9+5/6）×3.6
=1/9×3.6+5/6×3.6
=0.4+3
=3.4
2004×2004/2005
=（2005-1）×2004/2005
=2005×2004/2005-1×2004/2005
=2004-2004/2005
=2003又1/2005
17×17/18
=（18-1）×17/18
=18×17/18-1×17/18
=17-17/18
=16又1/18
5/8×4/11＋5/11×7/8
=4/8×5/11＋5/11×7/8
=（4/8+7/8）×5/11
=11/8×5/11
=5/8
=（18+1）×17/18
=18×17/18+1×17/18
=17+17/18
=17又17/18
（1/9+5/6）×3.6
=1/9×3.6+5/6×3.6
=0.4+3
=3.4
2004×2004/2005
=（2005-1）×2004/2005
=2005×2004/2005-1×2004/2005
=2004-2004/2005
=2003又1/2005
17×17/18
=（18-1）×17/18
=18×17/18-1×17/18
=17-17/18
=16又1/18
5/8×4/11＋5/11×7/8
=4/8×5/11＋5/11×7/8
=（4/8+7/8）×5/11
=11/8×5/11
=5/8
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