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口算练习,602=6003=903=9009=0100=8004=1505=27009=4806=6309=,262=963=4005=30005=0900=20005=1005=3303=070=5505=,6030=5070=20040=0900=5080=1070= 401=5020=3030=090=,1330=50120=8011=1450=2013=019= 124=2320=5080=6050=,0.2+0.8=6.3+1.7=5-1.3=9-2.5=4.8-1.3=1-0.5= 5.5+4.5=8-2.9=5.4+2.6=0+5.3=,3.4+0.7=6.3+0.2=4+2.6=8+1.3=3+1.4 =6.3+0.5=9.1-8.4=5.4-4=5.5-5=5.5-0.5=,估算练习,72818123596440913872324,125237854357297418464698,14123656718918534495640757088089,68315574213441090258881986 80144620853172190,5982144846118180289188123320 606422463012211332,笔算练习,（1）7505（2）5808（3）6093（4）8284（5）6035,
