1樓:郝躍朱運虹
1、原式=(1419+(1419+12900)+(1419+12900+129000)+(1419+12900+129000+1290000)+(1419+12900+129000+1290000+12900000)+(1419+12900+129000+1290000+12900000+129000000))/86=(16.5+(16.5+150)+(16.
5+150+1500)+(16.5+150+1500+15000)+(16.5+150+1500+15000+150000)+(16.
5+150+1500+15000+150000+1500000))=16.5*6+150*6+1500*5+15000*4+150000*3+1500000*2+15000000=18053499
2樓:桑煦黨元勳
1.1/100+3/100+5/100+……+95/100+97/100+99/100
=(1+3+……+99)/100
=[(1+99)*50/2]/100
=50/2
=252.10又4/5
-(8.8—5/7)+2/7
=10+4/5-(8+4/5)+(5/7+2/7)=10+4/5-8-4/5+1
=10-8+1
=33.5.2×1/4+0.18×2.5+25%=5.2×1/4+0.18×(10/4)+1/4=(5.2+1.8+1)×1/4
=8×1/4
=24.(9.6-10又1/2÷1.25)÷(1又1/3×3分之4)=[9.6-(10+1/2)×0.8]÷(4/3×4/3)
=(9.6-8-0.4)×9/16
=1.2×9/16
=0.675
5.(1+2/3)×(1-2/3)×(1+2/5)×(1-2/5)×……×(1+2/99)×(1-2/99)
=5/3
×1/3
×7/5
×3/5
×......×101/99
×97/99
=1/3
×(5/3
×3/5)
×(7/5
×5/7)
×(99/97
×97/99)
×101/99
=1/3
×101/99
=101/297
6.4!/5!
=(4×5×6×7)/(5×6×7×8×9)=1/18
3樓:
一,3.6*31又2/5+43.9*6又2/5+6
=3.6*(31+2/5)+43.9*(6+2/)+6
=3.6*31+3.6*2/5+43.9*6+43.9*2/5+6
=3.6*30+3.6+(3.6+43.9)*2/5+44.9*6
=108+3.6+47.5*2/5+(45-0.1)*6
=108+3.6+19+270-0.6
=108+19+270+3
=400
二,(81.4+1/6+1/4+1/5)/(1/6+1/4+1/5)
=81.4/(1/6+1/4+1/5) +(1/6+1/4+1/5) /(1/6+1/4+1/5)
=81.4/[(10+15+12)/60]+1
=81.4*60/37+1
=132+1
=133
三,51又2/3除以5/3+71又3/4除以7/4+91又4/5除以9/5
=(50+5/3)/(5/3)+(70+7/4)/(7/4)+(90+9/5)/(9/5)
=30+1+40+1+50+1
=123
四,6又7/10*121+444除以40/99+67*21.2
=6.7*121+6.7*212+444*99/40
=6.7*333+333*3.3
=333*(6.7+3.3)
=3330
五,(4又1/19-1/17)*(1/7+1/8+1/9)-4*(1/7-1/8+1/9)+(1/7+1/8+1/9)*(1/17-1/19)
=(4+1/19-1/17)*(1/7+1/8+1/9)+(1/7+1/8+1/9)*(1/17-1/19)- 4*(1/7-1/8+1/9)
=(1/7+1/8+1/9)(4+1/19-1/17+1/17-1/19)- 4*(1/7-1/8+1/9)
=4*(1/7+1/8+1/9)- 4*(1/7-1/8+1/9)
=4*(1/7+1/8+1/9-1/7+1/8-1/9)
=4*1/4=1
4樓:飛鵠墨人
難,,真不容易,,分,,基本上是衝著難題來的,可是慚愧,不會,,,,不過,還是想發發言,,說說話,,
但願樓主學有富車,,,
5樓:匿名使用者
這些題我看樓主還是自己做為好,這樣才能提高計算效率。
6樓:
一,3.6*31又2/5+43.9*6又2/5+6
=3.6*(31+2/5)+43.9*(6+2/)+6
=3.6*31+3.6*2/5+43.9*6+43.9*2/5+6
=3.6*30+3.6+(3.6+43.9)*2/5+44.9*6
=108+3.6+47.5*2/5+(45-0.1)*6
=108+3.6+19+270-0.6
=108+19+270+3
=400
二,(81.4+1/6+1/4+1/5)/(1/6+1/4+1/5)
=81.4/(1/6+1/4+1/5) +(1/6+1/4+1/5) /(1/6+1/4+1/5)
=81.4/[(10+15+12)/60]+1
=81.4*60/37+1
=132+1
=133
三,51又2/3除以5/3+71又3/4除以7/4+91又4/5除以9/5
=(50+5/3)/(5/3)+(70+7/4)/(7/4)+(90+9/5)/(9/5)
=30+1+40+1+50+1
=123
四,6又7/10*121+444除以40/99+67*21.2
=6.7*121+6.7*212+444*99/40
=6.7*333+333*3.3
=333*(6.7+3.3)
=3330
五,(4又1/19-1/17)*(1/7+1/8+1/9)-4*(1/7-1/8+1/9)+(1/7+1/8+1/9)*(1/17-1/19)
=(4+1/19-1/17)*(1/7+1/8+1/9)+(1/7+1/8+1/9)*(1/17-1/19)- 4*(1/7-1/8+1/9)
=(1/7+1/8+1/9)(4+1/19-1/17+1/17-1/19)- 4*(1/7-1/8+1/9)
=4*(1/7+1/8+1/9)- 4*(1/7-1/8+1/9)
=4*(1/7+1/8+1/9-1/7+1/8-1/9)
=4*1/4
=1 一、3.6*31又2/5+43.9*6又2/5+6
=3.6*31.4+43.9*6.4+6
=[10-6.4]*31.4+43.9*6.4+6
=314-6.4*31.4+43.9*6.4+6
=320+6.4[43.9-31.4]
=320+6.4*12.5
=320+0.8*8*12.5
=320+0.8*100
=400
二、(81.4+1/6+1/4+1/5)/(1/6+1/4+1/5)
=81.4/[1/6+1/4+1/5]+1
=81.4*60/[10+15+12]+1
=81.4*60/37+1
=[74+7.4]*60/37+1
=74*60/37+7.4*60/37+1
=120+12+1
=133
三、51又2/3除以5/3+71又3/4除以7/4+91又4/5除以9/5
=[51+2/3]*3/5+[71+3/4]*4/7+[91+4/5]*5/9
=51*3/5+2/5+71*4/7+3/7+91*5/9+4/9
=[50+1]*3/5+[70+1]*4/7+[90+1]*5/9+2/5+3/7+4/9
=30+3/5+40+4/7+50+5/9+2/5+3/7+4/9
=120+1+1+1
=123
四、67/10*121+444除以40/99+67*21.2
=67/10*11*11+444*99/40+67*21.2
=6.7*11*11+11.1*99+67*21.2
=6.7[121+212]+11.1*99
=6.7*333+33.3*33
=33.3[67+33]
=33.3*100
=3330
五、(4又1/19-1/17)*(1/7+1/8+1/9)-4*(1/7-1/8+1/9)+(1/7+1/8+1/9)*(1/17-1/19)
=(4+1/19-1/17)*(1/7+1/8+1/9)+(1/7+1/8+1/9)*(1/17-1/19)- 4*(1/7-1/8+1/9)
=(1/7+1/8+1/9)(4+1/19-1/17+1/17-1/19)- 4*(1/7-1/8+1/9)
=4*(1/7+1/8+1/9)- 4*(1/7-1/8+1/9)
=4*(1/7+1/8+1/9-1/7+1/8-1/9)
=4*1/4=1
奧數的簡便演算法
7樓:
5*(480+1)+321*(20+0.5)+(800+2)*(80-0.8)
=2400+5+6420+160.5+64000-640+160-1.6
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