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用简便方法计算7.2 +2.8×7.2

2.8+7.2×2.3 =2.8+16.56 =19.36 我个人认为没有简便。

7.2+2.8×5-1.2 =7.2+14-1.2 =21.2-1.2 =20

用简便方法计算下面各题2.8X1.6+1.6×7.2 解:根据提取公因式的简便方法, 原式=1.6x(2.8+7.2) =1.6x10 =16

7.2×24+15×2.8+9×2.8 =7.2×24+(15×2.8+9×2.8) =7.2×24+(15+9)×2.8 =7.2×24+24×2.8 =(7.2+2.8)×24 =10×24 =240

7.2乘0.25加2.8除以4 =7.2*0.25+2.8*0.25 =0.25*(7.2+2.8) =0.25*10 =2.5 不懂可追问,有帮助请采纳,谢谢!

7.2×3.6+3.6×2.8=(7.2+2.8)x3.6 =36

7.2+2.8x0.95 =7.2+2.8x(1-0.05) =7.2+2.8x1-2.8x0.05 =7.2+2.8-0.14 =1-0.14 =0.86

7.2 +2.8×5-1.2 =(7.2-1.2)+(3-0.2)×5 =6+3×5-0.2×5 =6+15-1 =20

37.9-2.8-7.2+2.1 =(37.9+2.1)-(2.8+7.2) =40-10 =30 行家正解,不明白可以追问!祝您学习进步 满意请点击下面的【选为满意回答】按钮,O(∩_∩)O谢谢

计算器!

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