下面各题怎样算简便就怎样算. 18.51-9.03-0.97 &nbs...
下面各题怎样算简便就怎样算.18.51-9.03-0.9732+6.4+68+3.615.5+26.5-20.41O.27+0.4-8.2724.6-3.98+5.4-6...
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.
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(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.
=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.
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