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下面各题怎样算简便就怎样算.

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下面各题怎样算简便就怎样算.
18.51-9.03-0.97                   32+6.4+68+3.6
15.5+26.5-20.4                   1O.27+0.4-8.27
24.6-3.98+5.4-6.02         64.3-18.75+15.7-11.25.
下面各题怎样算简便就怎样算.
(1)18.51-9.03-0.97                  
=18.51-(9.03+0.97)
=18.51-10
=8.51;
                  
(2)32+6.4+68+3.6
=(32+68)+(6.4+3.6)
=100+10
=110;
(3)15.5+26.5-20.4
=42-20.4
=21.6;
(4)1O.27+0.4-8.27
=1O.27-8.27+0.4
=2+0.4
=2.4;
(5)24.6-3.98+5.4-6.02
=(24.6+5.4)-(3.98+6.02)
=30-10
=20;
(6)64.3-18.75+15.7-11.25
=(64.3+15.7)-(18.75+11.25)
=80-30
=50.