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

4.04

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...

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。)

原式=11/90+21/90+31/90+41/90+51/90 =31×5/90 =31/18

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

(1+0.23+0.34)*(0.23+0.34+0.45)-(1+0.23+0.34+0.45)*(0.23+0.34) 令a=0.23+0.34 b=0.23+0.34+0.45 b-a=0.45 原式=(1+a)*b-(1+b)*a =b+ab-a-ab =b-a =0.45

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。

3.4/((1.25+0.45)*0.2)怎么简便计算? 3.4÷[(1.25+0.45)x0.2] =3.4÷[1.7x0.2] =3.4÷0.34 =10

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