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0.1+0.2+0.3+0.4+……+2.5的简便方法

类似高斯故事里的计算,让我们先观察一下算式,发现可以分组求和,首先为了方便计算可以先提取十分之一,然后再1+25 2+24 3+23 这样分成若干组和为26的算式,最后计算组数发现有12组,再加上落单的13,整理就得到最终结果32.5了,这是等差数列的...

0.1+0.2+0.3+0.4+…+2.5 =(0.1+2.5)x25÷2 =2.6x25÷2 =1.3x25 =32.5

0.1+0.3+0.5+0.7+……+0.99 =(0.1+0.3+...+0.9)+(0.11+0.13+...+0.99) =(0.1+0.9)*5/2+(0.11+0.99)*45/2 =2.5+22.5*1.1 =2.5+24.75 =27.25.

(0.1*2*0.3*4*0.5*6*0.7*8*0.9*10*1.1)/(2.2*2.4*2.5*2.7) = 2*3*4*5*6*7*8*9*10*11/22*24*25*27*10*10 (约去2*5=10; 3*9=27,以及11,10) = 4*6*7*8/2*24*25 (约去6*8=2*24) =4*7/25 =28/25

0.4△6 = 0.4+0.5+0.6+0.7+0.8+0.9=1.3*3=3.9 0.7△4 = 0.7+0.8+0.9+1.0=1.7*2=3.4

(1)1.97×0.25×0.4=1.97×(0.25×0.4)=1.97×0.1=0.197;(2)(2.5+0.25)×0.8=2.5×8+0.25×8=20+2=22;(3)3.2×12.5=(4×0.8)×12.5=4×(0.8×12.5)=4×10=40;(4)5.71×8.3-5.71×7.3=5.71×(8.3-7.3)=5.71×1=5.71;(5)0.25×0.44=0.25×(4×...

1÷2.5+2又1/2x0.4+1 =0.4+2.5x0.4+1 =0.4+1+1 =2.4

1+1.1+2.5-3.2+0.4-1.3-0算一算,分一分。一共有几种分法 ...3"知道翻译:有好多种方法呢。 评论 | 0 0 分享 2016-04-11 18:10 shi...

1.72+0.53+0.28+1.47 =(1.72+0.28)+(0.53+1.47) =2+2 =4 3.2×1.25×2.5 =4×0.8×1.25×2.5 =(4×2.5)×(0.8×1.25) =10×1 =10 3.9×99 =3.9×(100-1) =3.9×100-3.9×1 =390-3.9 =386.1

0.2÷2.5×(4.2-1.075) =0.2×0.4×3.125 =0.08×3.125 =0.08×3+0.08×0.125 =0.24+0.01 =0.25

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