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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

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。)

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...

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...

0.12+0.23+0.34+0.45+0.56+0.67+0.78+0.89=4.04

令a=0.34+0.45+0.56 原式=(1+a)(a+0.67)-(1+a+0.67)a =(1+a)a+0.67(1+a)-(1+a)a-0.67a =0.67(1+a)-0.67a =0.67+0.67a-0.67a =0.67

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

=(1+0.34+.045)x(0.34+0.45)+(1+0.34+.045)x0.56-(1+0.34+.045)x(0.34+0.45)-0.56x(0.34+0.45) =(1+0.34+.045)x0.56-0.56x(0.34+0.45) =0.56

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