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0.12(2循环)+0.23(3循环)+0.34(4循环)+0.45(5循环)...

11/90+21/90+31/90+41/90+51/90+61/90/+71/90+81/90 =(11+21+31+41+51+61+71+81)/90 =368/90 =4又4/45

0.12+0.23+0.34+0.45+0.56 =12/99+23/99+34/99+45/99+56/99 =170/99 =1.717171…… (答案绝对正确!这是涉及到怎样把循环小数化成分数的知识。)

您好: 0.12+0.23+0.34+0.45+0.56+0.67+0.78 =0.1+2/99+0.2+3/99+0.3+4/99+0.4+5/99+0.5+6/99+0.6+7/99+0.8+8/99 =(0.1+0.2+0.3+0.4+0.5+0.6+0.7+0.8)+(1+2+3+4+5+6+7+8)/99 =3.6+36/99 =3+3/5+4/11 =3+53/55 =3又53/55 如果本题有什么不明白可...

3.81

0.12+0.23+0.34+0.45+0.56+0.67+0.78+0.89 =(0.12+0.89)+(0.23+0.78)+(0.34+0.67)+(0.45+0.56) =1.01×4 =4.04

法一 (0.12+0.78)+(0.23+0.67)+(0.34+0.56)+(0.45+0.89) =0.9+0.9+0.9+1.34 =2.7+1.34 =4.04 法二 0.12+0.23+0.34+0.45+0.56+0.67+0.78+0.89 =(0.12+0.78)+(0.23+0.67)+(0.34+0.56)+0.45+0.89 =0.9+0.9+0.9+0.45+(0.9-0.01) =(0.9+0.9+0...

那个星号啥意思

解答: 解:8÷8×8÷8=1 2.3×4×0=0 120÷40=3 0.6-0.23=0.37 0.34+0.45=0.79 728+199=927 31+992÷32=62 900÷25÷4=9 0.12÷0.4=0.3 637-201=436 36×5×2=360 28×38+72×38=3800

最后是(0.23+0.34)的话: 假设A=0.12+0.23+0.34,B=0.23+0.34 原式=A×(B+0.45)-(A+0.45)×B, =AB+0.45A-AB-0.45B, =0.45×(A-B); 把A=0.12+0.23+0.34,与B=0.23+0.34代入上式得: 0.45×(0.12+0.23+0.34-0.23-0.34), =0.45×0.12, =0...

表述不清楚。“这是循环小数,最后一位循环。”写清楚点,不要随便省略。

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