9999+999+99+9 9999×2222+3333×3334 10000-1-2-3-4-...-80 1+2+3
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:2024/08/15 08:29:04
9999+999+99+9 9999×2222+3333×3334 10000-1-2-3-4-...-80 1+2+3+4+...+78+79+80 2007*2005/2000 要简算
450/20/9 4/5+3/5+2/5 (100+1000+200)/25 4/5*16+1/5/1/16 99000/25/4
169*5/13 99000/25 上面的能简算得要简算
450/20/9 4/5+3/5+2/5 (100+1000+200)/25 4/5*16+1/5/1/16 99000/25/4
169*5/13 99000/25 上面的能简算得要简算
![9999+999+99+9 9999×2222+3333×3334 10000-1-2-3-4-...-80 1+2+3](/uploads/image/z/5557334-14-4.jpg?t=9999%2B999%2B99%2B9+9999%C3%972222%2B3333%C3%973334+10000-1-2-3-4-...-80+1%2B2%2B3)
①9999+999+99+9
=10000+1000+100+9-3
=11106
②9999×2222+3333×3334
=3333×6666+3333×3334
=3333×(6666+3334)
=33330000
③10000-1-2-3-4-...-80
=10000-(1+80)×80÷2
=10000-3240
=6760
④1+2+3+4+...+78+79+80
=3240
⑤2007*2005/2000
=(2000+7)×(2000+5)/2000
= (2000²+12×2000+7×5)/2000
=2000+12+7/400
=2012/7/400
=10000+1000+100+9-3
=11106
②9999×2222+3333×3334
=3333×6666+3333×3334
=3333×(6666+3334)
=33330000
③10000-1-2-3-4-...-80
=10000-(1+80)×80÷2
=10000-3240
=6760
④1+2+3+4+...+78+79+80
=3240
⑤2007*2005/2000
=(2000+7)×(2000+5)/2000
= (2000²+12×2000+7×5)/2000
=2000+12+7/400
=2012/7/400
9999+999+99+9 9999×2222+3333×3334 10000-1-2-3-4-...-80 1+2+3
A=(999(9^1111)/(9999^2222)+1) B=((9999^2222)/(9999^3333)+1)
9999×2222+3333×3334
9999*2222+3333*3334
1+2+3+.+9999+10000+?
1+1+2+2+3+3.+9999+9999+10000+10000
9999×2222+3334×3333=
奥数题9999*2222+3333*3334
1+2+3+4+5''''''''+9999+10000+10000
9又3/1+99又3/1+999又3/1+9999又3/1+2又3/2
1+2+3+.+9999+10000-9999-9998-.-6750=?
用计算器计算(1)根号9×9+19;(2)根号99×99+199;(3)根号999×999+1999;(4)9999×9