1.2+2.3+3.4+4.5+5.612+23+34+45+56
1.2+2.3+3.4+4.5+5.612+23+34+45+56
(1.2+2.3+3.4+4.5+5.6+6.7)/(12+23+34+45+56+67)
1.2+2.3+3.4+4.5+5.6+6.7+7.8/12+23+34+45+56+67+78
计算:1.2+2.3+3.4+4.5+5.6+6.712+23+34+45+56+67.
巧算 12加23加34加45加56加67分之1.2加2.3加3.4加4.5加5.6加6.7
必须简算(1)12+23+34+45+56+67分之 1.2+2.3+3.4+4.5+5.6+6.7(2)3.41×9.
12 +23 +34+ 45 +56+ 67 +78 +89/1.2+ 3.4 +4.5 +5.6+6.7+ 7.8 +
简便计算:23.5乘5.66减23.4乘5.67 1.2/(1.2/2.3)/(2.3/3.4)/(3.4/4.5)
2.3.4.5.1.2.3.4求思路.可拍照.
1.2,2.3,3.4,4.5,5.6,(),( )找规律填空
1+12++23+34+45+56
1*2+23+34+45+56+...+99100