1-2+3-4+5-6+·····+99-100
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/25 21:23:18
1-2+3-4+5-6+·····+99-100
把18-(-13)+(-21)-(-42)写成省略括号的和是:
计算:见图
把18-(-13)+(-21)-(-42)写成省略括号的和是:
计算:见图
(1+3+5+...+97+99)-(2+4+...+98+100)
=(1+99)*50/2-(2+100)*50/2
=-50
18-(-13)+(-21)-(-42)
=18+13-21+42
=52
1/1x2+1/2x3+```````+1/2008x2009
=1-1/2+1/2-1/3+1/3-1/4+````````+1/2008-1/2009
=1-1/2009
=2008/2009
=(1+99)*50/2-(2+100)*50/2
=-50
18-(-13)+(-21)-(-42)
=18+13-21+42
=52
1/1x2+1/2x3+```````+1/2008x2009
=1-1/2+1/2-1/3+1/3-1/4+````````+1/2008-1/2009
=1-1/2009
=2008/2009
计算:(2+4+6+8+···+100)-(1+3+5+···+99)
(2+4+6+8+······+100)—(1+3+5+7+······+99)等于几
1-2+3-4+5-6+·····+99-100
计算1-2+3-4+5-6+······-98+99=
1-2+3-4+5-6+7-8+9······+99-100
1*2*3*4+2*3*4*5+3*4*5*6+······99*100*101*102 是多少?
计算:1+【-2】+3+【-4】+5+【-6】+···+【99】+【-100】=
1/2*3/4*5/6*···*99/100
数学奥林匹克1-2+3-4+5-6+···+97-98+99+100=?
1+3+5+···45+47+49+50+51+53+55+···+95+97+99-2-4-6-···-96-98-1
1×2×3×4+3×4×5×6+5×6×7×8+······﹢97×98×99×100求解
计算:-1+2+(-3)+4+(-5)+······+(-99)+100等于多少?