1999999+199999+19999+1999+199+19怎么简算
来源:学生作业帮助网 编辑:作业帮 时间:2024/05/18 11:34:57
199999+29999+3999+499+59=(200000-1)+(30000-1)+(4000-1)+(500-1)+(60-1)=234560-5=234555
999999×999999+1999999=999999×999999+999999+1000000=999999×(1+999999)+1000000=1000000×999999+1000000=
1.2000*5-1-2-3-4-5=10000-15=9985.2.200000+20000+2000+200+20-5=222220-5=222215
19+199+1999+19999+199999=(20-1)+(200-1)+(2000-1)+(20000-1)+(200000-1)=222220-5=222215
19+199+1999+19999+199999+1999999+.+1999个1999=(19+1+199+1+1999+1+19999+1+199999+1+1999999+1-6)+1999个1
19+199+1999+19999+199999+9+5=19+199+1999+19999+199999+9+1+1+1+1+1=(19+1)+(199+1)+(1999+1)+(19999+1)+
(2000000+200000+20000+2000+200+20)-6=2222220-6=2222214
第一题为199999+19999+1999+199+19=(200000-1)+(20000-1)+(2000-1)+(200-1)+(20-1)=222215
234560-5=234555再答:(199999+1)+(29999+1)+(3999+1)+(499+1)+(59+1)-5=200000+30000+4000+500+60-5=234560-5
1one19nineteen199onehundredandninety-nine1999onethousandninehundredandninety-nine19999nineteenthousa
9999999*9999999+1999999=(10^6-1)^2+1999999=10^12-2*10^6+1+19999999=10^12-2*10^6+2*10^6=10^12
199999+2999+3999+499+59=200000-1+3000-1+4000-1+500-1+50+9=207555
等于100000900000
nineteen,onehundredandninety-nine,onethousandandninehundredandninety-nine,nineteenthousandandandnine
=200-1+2000-1+20000-1+200000-1+4=200+2000+20000+200000=222200
19+199+1999+19999+199999=(20-1)+(200-1)+(2000-1)+(20000-1)+(200000-1)=222220-5=222215
99999^2+199999=(100000-1)^2+(200000-1)=100000^2-2*100000+1+2*100000-1=100000^2=10000000000
199999-19999-1999-199-19=200000-20000-2000-200-20+3=200000-22222+3=177778+3=177781再问:为什么后面是+3呢,不是同时每
(20000-1)x(2000-1)x(200-1)x(20-1)=【40000000-200-20000+1】x[2000-200-20+1]=3997980X1781=7120402380再答:你