2/3+2/9+2/27+2/81+2/243 9.6+99.6+999.6+9999.6+99999.6 2/1-1/
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/11/09 04:39:53
2/3+2/9+2/27+2/81+2/243 9.6+99.6+999.6+9999.6+99999.6 2/1-1/4-1/8-1/16-1/32-1/64怎么简便运算
2/3+2/9+2/27+2/81+2/243
=2(81+27+9+3+1)/243
=2× 121/243
=242/243
9.6+99.6+999.6+9999.6+99999.6
=10+100+1000+10000+100000-0.6×5
=111110-3
=111107
1/2-1/4-1/8-1/16-1/32-1/64
=1-(1-1/64)
=1/64
=2(81+27+9+3+1)/243
=2× 121/243
=242/243
9.6+99.6+999.6+9999.6+99999.6
=10+100+1000+10000+100000-0.6×5
=111110-3
=111107
1/2-1/4-1/8-1/16-1/32-1/64
=1-(1-1/64)
=1/64
2/3+2/9+2/27+2/81+2/243 9.6+99.6+999.6+9999.6+99999.6 2/1-1/
9.6+99.6+999.6+9999.6+99999.6
数学1-2/3-2/9-2/27-2/81-2/243-2/729 简算
1-2/3-2/9-2/27-2/81-2/243-2/729=?求简算
简便计算243+81+27+9+2+1+1/3+1/9+1/27+1/81+1/243
1/56+1/72+1/90+1/110 2/3+2/9+2/27+2/81+2/243+2/729
观察下面的数:(1)-3,9,-27,81,-243,729.(2)0,12,-24,84,-243,729.(3)-1
(1)3,9,27,81,243,729 ..(2) 1,7,25,79,241,727..(3) 1,3,9,27,8
2/3+2/9+2/27+2/81…+2/243
2/3+2/9+27/2+81/2+243/2等于多少
2/3+2/9+2/27+2/81+2/243计算规律是啥?
小学数学简便运算题1-2/3-2/9-2/27-2/81-2/243-2/7293/4+3/28+3/70+3/130+