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1 19 199 1999 19999的英语怎么读

19+199+1999+19999+199999+1999999+......+1999个1999 =(19+1+199+1+1999+1+19999+1+199999+1+1999999+1-6)+1999个1999 =(20+200+2000+20000+200000+2000000-6)+1999+1个1999+1-2 =(2222220-6)+2000个2000-2 =2222214+4000098 =6222312

1.9+19.9+199.9+1999.9+19999.9+0.5 =1.9+19.9+199.9+1999.9+19999.9+0.1+0.1+0.1+0.1+0.1 =(1.9+0.1)+(19.9+0.1)+(199.9+0.1)+(1999.9+0.1)+(19999.9+0.1) =2+20+200+2000+20000 =22222

1.9+19.9+199.9+1999.9+19999.9 =(2-0.1)+(20-0.1)+(200-0.1)+(2000-0.1)+(20000-0.1) =(2+20+200+2000+20000)-0.1*5 =22222-0.5 =22221.5

19999.9+1999.9+199.9+19.9+1.9 =20000+2000+200+20+2 - 0.1x5 =22222 - 0.5 =22221.5

19999.9+1999.9+199.9+19.9+1.9 =(20000-0.1)+(2000-0.1)+(200-0.1)+(20-0.1)+(2-0.1) =22222-0.1×5 =22221.5

1.9+19.9+199.9+1999.9+19999.9 =2+20+200+2000+20000-0.5 =22222-0.5 =22221.5

(1)999×87.5+87.5=87.5×(999+1)=87.5×1000=87500(2)199999+19999+1999+199+19=200000-1+20000-1+2000-1+200-1+20-1=222220-5=222215

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