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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。)

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

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

简便运算 3.4*0.45+0.34*4.3+3.4*0.12 =3.4*0.45+3.4*0.43+3.4*0.12 =3.4*(0.45+0.43+0.12) =3.4*1 =3.4

3.45×0.45+0.34 =3.45×(0.5-0.05)+0.34 =3.45×0.5-3.45×0.05+0.34 =1.725-0.1725+0.34 =1.725+(0.34-0.1725) =1.725+0.1675 =1.8925 满意请采纳,希望对你有帮助!

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

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