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.
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+0.888.43+2.97+0.0310-2.75-0.254.9+4.9-0.9-0.95.6+2.7-3.615.25-3.1+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. |
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