计算下面各题,怎样计算简便就怎样计算.3.78+(6.22+4.72) 21.21+38.38+9.79+2.62 102.03-12.2-2.8
计算下面各题,怎样计算简便就怎样计算.3.78+(6.22+4.72)21.21+38.38+9.79+2.62102.03-12.2-2.82.455-1.222+1....
计算下面各题,怎样计算简便就怎样计算.3.78+(6.22+4.72) 21.21+38.38+9.79+2.62 102.03-12.2-2.8 2.455-1.222+1.545
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①3.78+(6.22+4.72)
=3.78+6.22+4.72
=10+4.72
=14.72
②21.21+38.38+9.79+2.62
=(21.21+9.79)+(38.38+2.62)
=31+41
=72
③102.03-12.2-2.8
=102.03-(12.2+2.8)
=102.03-15
=87.03
=3.78+6.22+4.72
=10+4.72
=14.72
②21.21+38.38+9.79+2.62
=(21.21+9.79)+(38.38+2.62)
=31+41
=72
③102.03-12.2-2.8
=102.03-(12.2+2.8)
=102.03-15
=87.03
④2.455-1.222+1.545 =2.455+1.545-1.222 =4-1.222 =2.778 |
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