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2.4x3.9%3.8简便算法.

2.4*3.9-3.9+0.1=1.4*3.9+0.1=(1.5-0.1)*(4-0.1)+0.1=6-0.15-0.4+0.01+0.1=6-0.44=5.56

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

3.8X9.9 =3.8X(1一0.1) =3.8X1一3.8X0.1 =3.8一0.38 =3.42

3.8×9.9+0.38 =3.8×9.9+3.8×0.1 =3.8×(9.9+0.1) =3.8×10 =38

(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.

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

从0.1到4.0共有40个数。若2个一组,有20组。 4.0-3.9+3.8-3.7+3.6-3.5……+0.2-0.1 =(4.0-3.9)+(3.8-3.7)+(3.6-3.5)……+(0.2-0.1) =0.1×20 =2

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

3.7+3.8+3.9+4.0+4.1+4.2+4.3的简便计算 3.7+3.8+3.9+4.0+4.1+4.2+4.3 =(3.7+4.3)+(3.8+4.2)+(3.9+4.1)+4 =8*3+4 =28

解:3.02x3.9x3.8x2.08x4等于( 372.37 ) 3.02 x 3.9 x 3.8 x 2.08 x 4 = (3×100 + 2)/100 × (3×10 + 9)/10 × (3×10 + 8)/10 × (2×100 + 8)/100 ×4 = 302/100 × 39/10 × 38/10 × 208/100 × 4 = 151/50 × 39/10 × 19/5 × 52/25 × 4 = 23...

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