四年级数学题;用简便的方法计算:(递等式)120+653+47,440+123+60,412+35+75,119+345+181+55,66+34+533+

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四年级数学题;用简便的方法计算:(递等式)120+653+47,440+123+60,412+35+75,119+345+181+55,66+34+533+

四年级数学题;用简便的方法计算:(递等式)120+653+47,440+123+60,412+35+75,119+345+181+55,66+34+533+
四年级数学题;用简便的方法计算:(递等式)120+653+47,440+123+60,412+35+75,119+345+181+55,66+34+533+

四年级数学题;用简便的方法计算:(递等式)120+653+47,440+123+60,412+35+75,119+345+181+55,66+34+533+
120+653+47
=120+700
=820
440+123+60
=500+123
=623
412+35+75
=412+110
=522
119+345+181+55
=(119+181)+(345+55)
=300+400
=700
66+34+533
=100+533
=633