0.12+0.23+0.34+0.45+0.56+0.67+0.78+0.89,这是循环小数,循环最后一位,看得懂的来.........0.12+0.23+0.34+0.45+0.56+0.67+0.78+0.89,这是循环小数,看得懂的来,最后一位循环.

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0.12+0.23+0.34+0.45+0.56+0.67+0.78+0.89,这是循环小数,循环最后一位,看得懂的来.........0.12+0.23+0.34+0.45+0.56+0.67+0.78+0.89,这是循环小数,看得懂的来,最后一位循环.

0.12+0.23+0.34+0.45+0.56+0.67+0.78+0.89,这是循环小数,循环最后一位,看得懂的来.........0.12+0.23+0.34+0.45+0.56+0.67+0.78+0.89,这是循环小数,看得懂的来,最后一位循环.
0.12+0.23+0.34+0.45+0.56+0.67+0.78+0.89,这是循环小数,循环最后一位,看得懂的来.
........
0.12+0.23+0.34+0.45+0.56+0.67+0.78+0.89,这是循环小数,看得懂的来,最后一位循环.

0.12+0.23+0.34+0.45+0.56+0.67+0.78+0.89,这是循环小数,循环最后一位,看得懂的来.........0.12+0.23+0.34+0.45+0.56+0.67+0.78+0.89,这是循环小数,看得懂的来,最后一位循环.
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+0.9+0.9)+(0.45-0.01)
=3.6+0.44
=4.04
法三
其实很简单,就是小学题,你看,把小数变成分数,0.12变成12/100,结果加起来就变成
（12+23+34+45+56+67+78+89）/100=(90+90+90+45+89)/100=4.04

然后？

0.12+0.23+0.34+0.45+0.56+0.67+0.78+0.89，这是循环小数，循环最后一位，
把循环小数化成分数，循环小数化成分数有自己独特的方法，上面的算式化成
11/90+21/90+31/90+41/90+51/90+61/90+71/90+81/90=184/45

(0.12+0.23+0.34)×(0.23+0.34+0.45)-(0.12+0.23+0.34+0.45)×(0.23+0.34) （0.12+0.23+0.34）*（0.23+0.34+0.45）-（0.12+0.23+0.34+0.45）*（032+034）简便计算 0.12+0.23+0.34+0.45+0.56+0.67+0.78+0.89=? (1+0.23+0.34)*(0.23+0.34+0.45)-(1+0.23+0.34+0.45)*(0.23+0.34)简便运算 （1+0.23+0.34）×（0.23+0.34+0.45）-（1+0.23+0.34+0.45）×（0.23+0.34） 0.12+0.23+0.34+0.45+0.56注意!都是循环的,例如0.12的12循环,0.23的23循环 求解(1+0.12+0.23)*(0.12+0.23+0.34)-(1+0.12+0.23+0.34)*(0.12+0.23)=? 简便运算 (1+0.12+0.23)x(0.12+0.23+0.34)-(1+0.12+0.23+0.34)x(0.12+0.23) (1+0.12+0.23)*(0.12+0.23+0.34)-(1+0.12+0.23+0.34)*(0.12+0.23)= （1+0.12+0.23）×（0.12+0.23+0.34）- （1+0.12+0.23+0.34）×（0.12+0.23）. (1+0.12+0.23)X(0.12+0.23+0.34)-(1+0.12+0.23+0.34)X(0.12+0.23)=? (1+0.12+0.23)乘(0.12+0.23+0.34)_(1+0.12+0.23+0.34)乘(0.12+0.23) 0.12+0.23+0.34+0.45+0.56+0.67+0.78注意是循环小数,循环节在第二位 0.12+0.23+0.34+0.45+0.56答案是几 注：都是循环小数,第二位开始 0.12+0.23+0.34+0.45+0.56+0.67+0.78注意是循环小数,循环节在第二位 《2》 简便运算（1+0.12+0.23）X(0.12+0.23+0.34) - (1+0.12+0.34)X(0.12+0.23) （0.12＋0.23＋0.34）*（0.23＋0.34＋0.45）－（0.12＋0.23＋0.34＋0.45）这是题目,看我打字辛苦的份上帮帮我 (1+0.12+0.23)x(0.12+0.23+0.34)-(1+0.12+0.23+0.34)x(0.12+0.23)等于几?用简便方法计算!