19991+199.1+19.91+1.991 88.88*0.9+22.22*6.4 简算

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19991+199.1+19.91+1.991 88.88*0.9+22.22*6.4 简算
19991+199.1+19.91+1.991 88.88*0.9+22.22*6.4 简算

19991+199.1+19.91+1.991 88.88*0.9+22.22*6.4 简算
19991+199.1+19.91+1.991
=20000-9+200-0.9+20-0.09+2-0.009
=20222-9.999
=20212.0001
88.88*0.9+22.22*6.4
=22.22x4x0.9+22.22x6.4
=22.22x(3.6+6.4)
=22.22x10
=222.2

（1）因为该数列为等比数列
所以原式=1.991（1-（1-10^4))/(1-10)
（2）原式=22.22(3.6+6.4)
=222.2

19991+199.1+19.91+1.991
=20000-9+200-0.9+20-0.09+2-0.009
=20222-9.999
=20222-10+0.001
=20212.001

88.88x0.9+22.22x6.4
=22.22x4x0.9+22.22x6.4
=22.22x(3.6+6.4)
=22.22x10
=222.2

19991+199.1+19.91+1.991 88.88*0.9+22.22*6.4 简算 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~ 1993×199.2-1992×199.1=( ) 1993乘199.2-1992乘199.1思路 1993乘199.2-1992乘199.1求思路根剧 1993乘199.2-1992乘199.1等于几? 199.5*199.4-199.1*199.8 怎么简算?过程! 答案! 1.在下列各式的等号左端添上+,-,×,÷,（ ）,使等式成立.1 2 3 4 5 4 3 2 1=19991 2 3 4 5 4 3 2 1=20001 2 3 4 5 4 3 2 1=20011 2 3 4 5 4 3 2 1=20022.请在下列各式中分别插入一个数码,使之成为等式：1×11×111=111111 3× 19.94-19.91+19.88-19.85+19.82-……+1.04-1.01简便计算 1/2001-1/2000的绝对值+1/2000-1/1999的绝对值-1/19991/2002的绝对值等于几?