1/3 + 1/6 + 1/10 + 1/15 + 1/21 + 1/28 + 1/36 + 1/45 + 1/55=?
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/05/15 02:34:23
1/3 + 1/6 + 1/10 + 1/15 + 1/21 + 1/28 + 1/36 + 1/45 + 1/55=?
规律是?
规律是?
规律略
原式=2*(1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110)
=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+1/9-1/10+1/10-1/11)
=2*(1/2-1/11)
=2*9/22
=9/11
原式=2*(1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90+1/110)
=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+1/9-1/10+1/10-1/11)
=2*(1/2-1/11)
=2*9/22
=9/11
1/3 + 1/6 + 1/10 + 1/15 + 1/21 + 1/28 + 1/36 + 1/45 + 1/55=?
1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/55+1/66
1\3+1\6+1\10+1\15+1\21+1\28+1\36+1\45+1\50+1\55
1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/50+1/55=?
小六计算题1+1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/55=?如果把他都改成-号
1\3+1\6+1\10+1\15+1\21+1\28+1\36+1\45+1\55+1\66+1\78+1\91+1\
1+1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/55+1/66+.+1/202105
1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/55+1/66+1/78+1/91
3分之1+6分之1+10分之1+15分之1+21分之1+28分之1+36分之1+45分之1+55分之1=?
1/3+1/8+1/10+1/15+1/21+1/28+1/36+1/45+1/55
【急】!简便运算!(1) 1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/55+1/66
计算:1/3+1/6+1/10+1/15+1/21+1/28+1/36+1/45+1/55+1/66+q/78+1/91