999.9+99.9+9.9+0.9的简便方法计算?

999.9+99.9+9.9+0.9 =(1000-0.1)+(100-0.1)+(10-0.1)+(1-0.1)=1000+100+10+1-0.1*4 =1111-0.4 =1110.6 497-97*3+37 =(497-97)-(100-3)*2+37 =400-100*2+2*3+37 =200+6+37 =243 6.92-8/11-3/11+3.18 =(6.92+3.18)-(8+3)/11 =10.1-1 =...

999.9+99.9+9.9+0.9 =1000-0.1+100-0.1+10-0.1+0.9 =1000+100+10+0.9-0.1-0.1-0.1 =1110+0.9-0.3 =1110+0.6 =1110.6

999.9+99.9+9.9+0.9 =1000-1+0.9+100-1+0.9+10-1+0.9+0.9 =1110-3+0.9×4 =1110-3+3.6 =1110.6 6.92－8/11－3/11+3.18 =6.92－（8/11+3/11）+3.18 =6.92+3.18-1 =10-1 =9 497-97×3+37 =400+97-97×3+37 =400+97×（1-3）+37 =400-97×2...

999.9+99.9+9.9+0.9 =1000-0.1+100-0.1+10-0.1+1-0.1 =1000+100+10+1-4*0.1 =1111-0.4 =1110.6

解：原式=（1000-0.1）+（100-0.1）+（10-0.1）+（1-0.1）=1111-0.4=1110.6 希望采纳，谢谢

999.9+99.9+9.9+0.9 =1000-0.1+100-0.1+10-0.1+1-0.1 =1000+100+10+1-4*0.1 =1111-0.4 =1110.6

=1000+100+10+1-0.1-0.1-0.1-0.1=1111-0.4=1110.6

999.9+99.9+9.9+0.9 =(1000-0.1)+(100-0.1)+(10-0.1)+(1-0.1)=1111-4*0.1=1110.6 497-97×3+37 =497-(100-3)×3+37=497-300+9+37=197+46=243 6.92+11分之8+11分之3+3.18 =6.92+（11分之8+11分之3）+3.18 =6.92+1+3.18 =6.92+3.18 +1 =10...

您好 很高兴为您解答 原式＝ 999.9+99.9+9.9+（0.1+0.1+0.1+0.6）= （999.9+0.1）+（99.9+0.1）+（9.9+0.1）+0.6= 1000+100+10+0.6= 1110.6

999.9+99.9+9.9+0.9 =1000-0.1+100-0.1+10-0.1+1-0.1 =1111-0.4 =1110.6 497-97*3+37 =497-100*3+3*3+37 =497+3-300+3+3+37 =243