神马作文网1.9.1.99.1.999.1.9999等越来越接近什么
来源：学生作业帮助网 编辑：作业帮 时间：2024/11/12 08:58:46
=1.99*(1.99-1.98)+0.99^2=1.99*(0.01)+0.99^2=(1+0.99)*0.01+0.99*0.99=0.01+0.99*0.01+0.99*0.99=0.01+0.
1.9+1.99+1.999+1.9999+1.99999=2-0.1+2-0.01+2-0.001+2-0.0001+2-0.00001=10-0.11111=9.8888928*1111+9999
2x6-(0.1+0.01+0.001+0.0001+0.00001+0.000001)=12-0.111111=11.888889
1999+199.9+19.99+1.9992222-1.111=2220.889
1999+199.9+19.99+1.999=1999+1+199.9+0.1+19.99+0.01+1.999+0.001-0.001-0.01-0.1-1=2000+200+20+2-1.111=
=2-0.1+2-0.01+2-0.001=6-0.111=5.889
1.99999+1.9999+1.999+1.99+1.9=2-0.00001+2-0.0001+2-0.001+2-0.01+2-0.1=10-0.11111=9.88889
9999+2-0.001+2-0.01+2-0.1=10005-0.111=10004.999
1999+199.9+19.99+1.999=2000-1+200-0.1+20-0.01+2-0.001=2000+200+20+(2-1-0.1-0.01-0.001)=2220+0.889=22
1999+199.9+19.99+1.999=2000-1+200-0.1+20-0.01+2-0.001=2000+200+20+(2-1-0.1-0.01-0.001)=2220+0.889=22
0.1999+1.999+19.99+199.9＝0.2+2+20+200-0.1-0.01-0.001.0.0001＝222.2-0.1111＝222.0889
1.99²-1.98*1.99+0.99²=1.99²-2*0.99*1.99+0.99²=(1.99-0.99)²=1
=1.99*1.99-1.98*1.99+0.99*0.99=1.99（1.99-1.98）+0.99*0.99=1.99*0.01+0.99*0.99=（1+0.99）*0.01+0.99*0.99
利用因式分解计算：1.99²+1.99×0.01=1.99×(1.99+0.01)=1.99×2=3.98;很高兴为您解答,skyhunter002为您答疑解惑如果本题有什么不明白可以追问,
题目不清楚!到底这串数字有规律没有!
原式=(0.2-0.0001)+(2-0.001)+(20-0.01)+(200-0.1)=200+20+2+0.2-0.1-0.01-0.001-0.0001=222.2-0.1-0.01-0.00
1.99*9.9=(2-0.01)*(10-0.1)=20-0.2-0.1+0.001=20.001-0.3=19.701再问：能说下0.2、0.1、0.001是怎么算出来的吗再答：1.99*9.9=
1.99²-98×100=99²-(99-1)·(99+1)=99²-(99²-1)=12.(xy+3)·(xy-3)=x²y²-3
=(10-0.1)*9.9+1.99=99-0.99+1.99=100