1991+199.1+19.91+1.991
来源:学生作业帮助网 编辑:六六作业网 时间:2024/12/23 05:30:08
1991+199.1+19.91+1.9911991+199.1+19.91+1.9911991+199.1+19.91+1.9911991+199.1+19.91+1.991=1991×(1+0.1
1991+199.1+19.91+1.991
1991+199.1+19.91+1.991
1991+199.1+19.91+1.991
1991+199.1+19.91+1.991
=1991×(1+0.1+0.01+0.001)
=1991×1.111
=(2000-9)×1.111
=2000×1.111-9×1.111
=2222-9.999
=2222-10+0.001
=2212+0.001
=2212.001
或
1991+199.1+19.91+1.991
=(2000-9)+(200-0.9)+(20-0.09)+(2-0.009)
=2222-9.999
=2222-(10-0.001)
=2222-10+0.001
=2212.001
1991+199.1+19.91+1.991
=1.991*(1000+100+10+1)
=1111*1.991
=2212.001
1991+199.1+19.91+1.991
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=?(简便方法)
简算题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
计算:1990+19901990+199019901990+…/1991+19911991+199119911991+…
(1+3+7+…+1991)-(2+4+6+8+…+1990)=急
41.2×8.1+11×1.25+5.37×1.9=?能简算要简算
1+2+3+.+1990+1991所得的积是奇数还是偶数?为什么?
3(x+1.9)=7.8
1.9×4.5+0.45 怎样才能简便计算
(1)5+10+15+20+25+···+85+90+95+100(2)﹙1+3+5+7+···+1991﹚-﹙2+4+6+8+···+1990﹚
1993+1992—1991-1990+1989+1988—1987—1986+.+5+4-3-2+1如题
九年级英语问题急求解答+++++++++++++++++++++++急求解答+++++++++++++++++++++++
111+222+333+444+555+666+777+888++++++++++++++++++++++999=?