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学以致用,一、填空。,6.7+4.95+3.3=6.7+( )+4.95=( ),(1.38+1.75)+0.25=1.38+( + )=( ),6.37-2.5-1.5=6.37-( )=( ),3.3,14.95,1.75,0.25,3.38,2.5+1.5,2.37,学以致用,二、判断,下面各题能不能简算。,17.5-3.56+6.44 ( ) 120.39-87.62-12.38 ( ) 32.17+0.45+3.29 ( ) 4. 42+9.63+1.37+28 ( ),学以致用,三、用简便方法计算下面各题。,2.78+0.3+1.7 5.2+63.43+0.57 5.17-2.8-1.2 13.25-(6.25+3.5) 42+9.63+1.37+28 7.02-3.5+0.98,易错提醒,想一想。,10-0.1-0.2-0.3-0.4-0.5-0.6-0.7-0.8-0.9,=10-(0.1+0.9)-(0.2+0.8)- (0.3+0.7)-(0.4+0.6)-0.5,=10-1-1- 1-1-0.5,=5.5,