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

0.12+0.23+0.34+0.45+0.56+0.67+0.78 =(0.1+0.2+0.3+0.4+0.5+0.6+0.7)+(0.02+0.03+0.04+0.05+0.06+0.07+0.08) =(0.1+0.7)×7÷2+(0.02+0.08)×7×2 =0.8×7÷2+0.1×7÷2 =0.9×7÷2 =3.15

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...

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...

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

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...

每个数位都是1加到91加到9=(1+9)*9/2=45得原算式=45*11。11=499。95

7.34×0.45+0.734×4.3+73.4×0.012 =7.34×(0.45+0.43+0.12) =7.34×1 =7.34 你好,本题已解答,如果满意 请点右下角“采纳答案”。

(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

34×0.45+5.4×3.4+0.34 =34×0.45+0.54×10×3.4+34×0.01 =34×0.45+0.54×34+34×0.01 =34×(0.45+0.54+0.01) =34×1 =34

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