2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1的简便计算时间紧迫,只求星期一来到答案!我们是小学生第一步老师规定是1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9简便~明天要上学了,再没答案我就死定了~@.@ 5.5
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/01 07:16:24
![2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1的简便计算时间紧迫,只求星期一来到答案!我们是小学生第一步老师规定是1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9简便~明天要上学了,再没答案我就死定了~@.@ 5.5](/uploads/image/z/18450-18-0.jpg?t=2%2F1%2B6%2F1%2B12%2F1%2B20%2F1%2B30%2F1%2B42%2F1%2B56%2F1%2B72%2F1%E7%9A%84%E7%AE%80%E4%BE%BF%E8%AE%A1%E7%AE%97%E6%97%B6%E9%97%B4%E7%B4%A7%E8%BF%AB%2C%E5%8F%AA%E6%B1%82%E6%98%9F%E6%9C%9F%E4%B8%80%E6%9D%A5%E5%88%B0%E7%AD%94%E6%A1%88%21%E6%88%91%E4%BB%AC%E6%98%AF%E5%B0%8F%E5%AD%A6%E7%94%9F%E7%AC%AC%E4%B8%80%E6%AD%A5%E8%80%81%E5%B8%88%E8%A7%84%E5%AE%9A%E6%98%AF1x2%2B2x3%2B3x4%2B4x5%2B5x6%2B6x7%2B7x8%2B8x9%E7%AE%80%E4%BE%BF%7E%E6%98%8E%E5%A4%A9%E8%A6%81%E4%B8%8A%E5%AD%A6%E4%BA%86%2C%E5%86%8D%E6%B2%A1%E7%AD%94%E6%A1%88%E6%88%91%E5%B0%B1%E6%AD%BB%E5%AE%9A%E4%BA%86%7E%40.%40+5.5)
2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1的简便计算时间紧迫,只求星期一来到答案!我们是小学生第一步老师规定是1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9简便~明天要上学了,再没答案我就死定了~@.@ 5.5
2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1的简便计算
时间紧迫,只求星期一来到答案!
我们是小学生第一步老师规定是1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9简便~明天要上学了,再没答案我就死定了~@.@ 5.5
2/1+6/1+12/1+20/1+30/1+42/1+56/1+72/1的简便计算时间紧迫,只求星期一来到答案!我们是小学生第一步老师规定是1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9简便~明天要上学了,再没答案我就死定了~@.@ 5.5
1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)+1/(7*8)+1/(8*9)
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5) +(1/5-1/6)+(1/6-1/7)+(1/7-1/8)+(1/8-1/9)
=1-1/9
=8/9
谢
1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)+1/(7*8)+1/(8*9)
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5) +(1/5-1/6)+(1/6-1/7)+(1/7-1/8)+(1/8-1/9)
=1-1/9
=8/9
2%1+6%1+12%1+20%1+30%1
1/2+1/6+1/12+1/20+1/30
1/2,-1/6,1/12,-1/20,1/30
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72
1+1/2+1/12+1/6+1/20+1/30+1/40+1/56
1+1/2+1/6+1/12+1/20+1/30.+1/901+1/2+1/6+1/12+1/20+1/30+.+1/90简便计算
1/2+1/6+1/12+1/20+1/30+1/42+1/56 简算
1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,
简便运算:1/2+1/6+1/12+1/20+1/30+1/42+1/56
1+1/2+1/6+1/12+1/20+1/30+1/42的简便计算
2/1+6/1+12/1+20/1+30/1+42/1+56/1=?
1/2 - 1/6 - 1/12 - 1/20 - 1/30 - 1/42 - 1/56怎么算
1/2+1/6+1/12+1/20+1/30+.1/380+1/420=
1+1/2+1/6+1/12+1/20+1/30+1/42=?
1/2+1/6+1/12+1/20+1/30+1/42+1/56
1/2-1/6-1/12-1/20-1/30-1/42-1/56等于多少
2/1+6/1+12/1+20/1+30/1+42/1+56/1=