1.1\2-[-(+1\6)-(+1\12)]+[-(-1\20)+1\30]-[(-1\42)+1\56]
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/08/27 00:11:59
1.1\2-[-(+1\6)-(+1\12)]+[-(-1\20)+1\30]-[(-1\42)+1\56]
本人只知道这么写:
=1×1\2+1\2×1\3+1\3×1\4+1\4×1\5+1\5×1\6-1\7×1\8
2.在1、2、3、……、50前添加“+”或“-”,并求它们的和,所得结果的最小非负数是多少?请列式解答.
本人只知道这么写:
=1×1\2+1\2×1\3+1\3×1\4+1\4×1\5+1\5×1\6-1\7×1\8
2.在1、2、3、……、50前添加“+”或“-”,并求它们的和,所得结果的最小非负数是多少?请列式解答.
1.原式=1×1\2+1\2×1\3+1\3×1\4+1\4×1\5+1\5×1\6-1\7×1\8
=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
=1/2+1/2-1/7-1/7+1/8
=1-2/7+1/8
=5/7+1/8
=47/56=7/8
2.-1+2+(3-4-5+6)+(7-8-9-10)+...+(47-48-49-50)=1
绝对正确的,放心吧!如果有什么不懂的还可以问我O(∩_∩)O哈!
=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
=1/2+1/2-1/7-1/7+1/8
=1-2/7+1/8
=5/7+1/8
=47/56=7/8
2.-1+2+(3-4-5+6)+(7-8-9-10)+...+(47-48-49-50)=1
绝对正确的,放心吧!如果有什么不懂的还可以问我O(∩_∩)O哈!
1.1/2+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)+1\56]
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=?
1/2+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
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等于多少
1/2+1/6+1/12+1/20+1/30+1/42+1/56简算,
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+1/42+1/56=