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1.用简便方法计算,写出简算过程。 (1)4.25+3.28+1.75+0.72 (2)38.6×2.8-8.6×2.8 2.用简便方法计算下面各题 (1)547+279-447 (2)35×22 (3)276-(76+158)答案提示: 1.(1)解:4.25+3.28+1.75+0.72 2.=(4.25+1.75)+(3.28+0.72) 3.=6+4 4.=10 5.(2)解:38.6×2.8-8.6×2.8 6.=(38.6-8.6)×2.8 7.=30×2.8 8.=84 (1)解:547+279-447 =547-447+279 =100+279=379 (2)解:35×22 =35×(20+2) =35×20+35×2 =700+70 =770 (3)解:276-(76+158) =276-76-158 =200-158 =42





























































