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怎样算简便怎样算.10-0.54-0.46;      &n

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怎样算简便怎样算.
10-0.54-0.46;              
(280+260)÷(216÷12)72×125;
75+360÷(20-5)450÷5÷9;                     
9.5+4.85-6.13.
怎样算简便怎样算.10-0.54-0.46;      &n
(1)10-0.54-0.46
=10-(0.54+0.46)
=10-1
=9;
(2)(280+260)÷(216÷12)
=540÷18
=30;
(3)72×125
=9×8×125
=9×(8×125)
=9×1000
=9000;
(4)75+360÷(20-5)
=75+360÷15
=75+24
=99;
(5)450÷5÷9
=450÷(5×9)
=450÷45
=10;
(6)9.5+4.85-6.13
=14.35-6.13
=8.22.