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2.4x3.9%3.8简便算法.

6.1×3.8+3.8×3.9 =3.8x(6.1+3.9) =3.8x100 =380 希望能帮到你

3.8×1.2+18.9÷0.9 首先整体乘以100再除以100,即 [100×(3.8×1.2+18.9÷0.9)]÷100, =(38×12+189÷9)÷100 =[(40-2)×12+189÷9]÷100 =(40×12-2×12+189÷9)÷100 . . 这样就很简便了 第二道答案是2441/176

(1)本算式错用了结合律而导致计算结果错误.正确算法为:2.4×3.9-3.8=9.36-3.8,=5.56;(2)算式中0.26×0.85运算结果的小数点位置点错而致计算结果错误,正确结果为:0.26×0.85+7.8=0.221+7.8,=8.021.

5.7×3.9-3.8 =22.23-3.8 =22.23-4+0.2 =18.23+0.2 =18.43

3.8-2÷11-3/11×3 =3.8-2/11-9/11 =3.8-(2/11+9/11) =3.8-1 =2.8

4.75*0.8+0.4*6.25=0.4(4.75*2+6.25)=0.4(9.5+6.25)=0.4*15.75=6.3

3.8/3.9+3.9/0.1+0.1/3.9 =1/3.9*(3.8+0.1)+39 =1+39 =40

你好,很高兴为你解答近似数是9.8的三位小数最小是(9.750)满意采纳哦!

-4.1<-3.9<3.8 回答完毕~ 有疑问请追问~无疑问请点击【采纳】~ 祝学习进步\(^o^)/~~~

解:原式=3.9-3.8x(5+0.7) =3.9-3.8x5-3.8x0.7 =3.9-19-2.65 =3.9-2.65-19 =1.25-19 =-17.75 分析:主要考察拆分法的简便方法。

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