10减18又20分之9除以9.
=10-(18+9/20)÷9
=10-2-1/20
=8-1/20
=7+19/20
=7又20分之19；
下一题,8又5分之二减2又2分之一乘以3又三分之一.
=(8+2/5)-(2+1/2)×(3+1/3)
=8+2/5-(5/2)×10/3
=8+2/5-25/3
=2/5-1/3
=6/15-5/15
=1/15;
还有一题,50分之一加2减0.47的差除以20分之三,
=(1/50+2-0.47)÷3/20
=1.55×20/3
=31/3;
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