1991+199.1+19.91+1.991=?(简便方法)
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1991+199.1+19.91+1.991=?(简便方法)1991+199.1+19.91+1.991=?(简便方法)1991+199.1+19.91+1.991=?(简便方法)1991+199.1
1991+199.1+19.91+1.991=?(简便方法)
1991+199.1+19.91+1.991=?(简便方法)
1991+199.1+19.91+1.991=?(简便方法)
1991+199.1+19.91+1.991
=1.991*(1000+100+10+1)
=(2-0.009)*1111
=2222-9.999
=2222-10+0.001
=2212.001
1991+199.1+19.91+1.991
1991+199.1+19.91+1.991=?(简便方法)
简算题1991+199.1+19.91+1.991=
1991+199.1+19.91+1.991
巧算题求解1991+199.1+19.91+1.991
1991+199.1+19.91+1.991+0.1991 怎么简便运算
用简便方法计算:1991+199.1+19.91+1.991
求 算术 1991+199.1+19.91+1.991=?求 算术 1991+199.1+19.91+1.991=?要一些过程,不要结果,要结果计算机
1991+199.1+19.91+1.991,用简便算法怎么算?四年级下学期奥数,应该有人会的,求帮助,谢啦~
19991+199.1+19.91+1.991 88.88*0.9+22.22*6.4 简算
有一串数199141419914141……共1991位数?其中有几个1.9.4
1993×199.2-1992×199.1=( )
1993乘199.2-1992乘199.1思路
150-120除以1.4×0.84 简算17又2/5×37-174×1.9+17又2/5×82 简算1999又1991/1999×1/4-1997/1999 简算
1991*1991-1990*1990
2.5x(1.9+1.9+1.9+1.9)=?
1993乘199.2-1992乘199.1求思路根剧
1993乘199.2-1992乘199.1等于几?