6.5*9.9+6.5*0.1简便方法计算
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3分之一+6分之1-9分之8
=1/2-9/8
=-7/9
3.4*9.9
=3.4*（10-0.1）
=34-0.34
=33.66
12.5*17+24*2.5-2.5
=2.5*（85+24-1）
=2.5*108
=2.5*4*27
=10*27
=270
12.5*88
=12.5*8*11
=10*11
=110
12.5*8.8
=12.5*8+12.5*0.8
=100+10
=110
