下面各题怎么计算简便就怎么计算. 9.12+4.5+0.88 8.43+2.97+0.0310-2.75-0.25 &nbs...
下面各题怎么计算简便就怎么计算.9.12+4.5+0.888.43+2.97+0.0310-2.75-0.254.9+4.9-0.9-0.95.6+2.7-3.615.2...
下面各题怎么计算简便就怎么计算. 9.12+4.5+0.88 8.43+2.97+0.0310-2.75-0.25 4.9+4.9-0.9-0.9 5.6+2.7-3.6 15.25-3.1+0.75-4.9.
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①9.12+4.5+0.88,
=(9.12+0.88)+4.5
=14.5;
②8.43+2.97+0.03,
=8.43+(2.97+0.03),
=8.43+3,
=11.43;
③10-2.75-0.25,
=10-(2.75-0.25),
=10-3,
=7;
④4.9+4.9-0.9-0.9,
=(4.9-0.9)+(4.9-0.9),
=4+4,
=8;
⑤5.6+2.7-3.6,
=(5.6-3.6)+2.7,
=2+2.7,
=4.7;
⑥15.25-3.1+0.75-4.9
=(15.25+0.75)-(3.1+4.9),
=16-8,
=8.
=(9.12+0.88)+4.5
=14.5;
②8.43+2.97+0.03,
=8.43+(2.97+0.03),
=8.43+3,
=11.43;
③10-2.75-0.25,
=10-(2.75-0.25),
=10-3,
=7;
④4.9+4.9-0.9-0.9,
=(4.9-0.9)+(4.9-0.9),
=4+4,
=8;
⑤5.6+2.7-3.6,
=(5.6-3.6)+2.7,
=2+2.7,
=4.7;
⑥15.25-3.1+0.75-4.9
=(15.25+0.75)-(3.1+4.9),
=16-8,
=8.
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