五年级数学的奥数题,急!至少10道啊!
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五年级数学的奥数题,急!至少10道啊!
五年级数学的奥数题,急!至少10道啊!
五年级数学的奥数题,急!至少10道啊!
1、小明、小李、小刚和我都想和小精灵明明、聪聪单独照一张相,再全体合影一张,一共要照( )张.
2、一张5角、一张1元、一张5元、一张10元,每次取出两张,取出的钱共有( )种情况.
3、7个同学排成两排照相,前排3人,后排4人,共有( )站法.
4、掷两个骰子,骰子六个面分别标上1,2,3,4,5,6这六个数字,掷出的数字之和为奇数的可能性为( ),掷出的数字之和为9的可能性为( ).
5、6根胡萝卜换2个大萝卜,9个大萝卜换3棵大白菜,6棵大白菜换( )根胡萝卜.
6、在一条公园小路旁边放一排花盆,每两盆花之间距离为4米,共放了25盆,现在要改成每6米放一盆,有( )盆花不必搬动.
7、妈妈要烙20张饼,每次只能烙3张饼,两面都要烙,每面烙2分钟,妈妈至少要用( )分钟才能烙好饼.
8、小明、小叶、小玲同时来到医务室就诊,小明包扎伤口需5分钟,小叶打针需3分钟、小叶吃感冒药需要1分钟,应怎样安排就诊顺序( ),三人等候时间的总和最短需要( )分钟.
9、两人轮流报数,每人只能报1或2,把两人所报的数全加起来,谁报数后和是20,谁就获胜.如果让你先报,为确保获胜,第一次先报( ),接下来( ).
10、烧水8分钟、洗水壶1分钟、洗水杯2分钟、接水1分钟、找茶叶1分钟、沏茶1分钟,怎样尽快让客人喝上茶,最短需要( )分钟.
34×3.535-3.5×34.34
=34×3.5×1.01-3.5×34×1.01
=0
8+89+899+8999+89999
=9+90+900+9000+90000-5
=99999-5
=99994
0.67×2.1+0.018×21+8.5×0.79
=0.67×2.1+0.18×2.1+8.5×0.79
=(0...
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34×3.535-3.5×34.34
=34×3.5×1.01-3.5×34×1.01
=0
8+89+899+8999+89999
=9+90+900+9000+90000-5
=99999-5
=99994
0.67×2.1+0.018×21+8.5×0.79
=0.67×2.1+0.18×2.1+8.5×0.79
=(0.67+0.18)×2.1+8.5×0.79
=0.85×2.1+0.85×7.9
=0.85×(2.1+7.9)
=0.85×10
=8.5
22222.2×9.99999
=22222.2×(10-0.00001)
=222222-0.222222
=222221.777778
1997×19961996-1996×19971997
=1997×1996×10001-1996×1997×10001
=0
0.02+0.04+0.06+0.08+……+19.94+19.96+19.98
=(0.02+19.98)×999÷2
=10×999
=9990
99999×77778+33333×66666
=99999×77778+99999×22222
=99999×(77778+22222)
=99999×100000
=9999900000
(4又5/6-3又3/4)/(3/14+2/7)
=13/12÷1/2
=13/6
=2又1/6
(4.8/1又4/5+3又1/2+7又1/3)*4/9
=(2又2/3+7又1/3+3.5)*4/9
=(10+3.5)*4/9
=13.5*4/9
=6
17.2/【(3又2/5-1.25)*2/3】
=17.2/【2.15*2/3】
=17.2÷43/3
=1.2
5*5又1/5
=5*5+5*1/5
=25+1
=26
(5又2/5-1.8)/[(1.15+13/20)*1又2/3]
=3.6/[1.8*5/3]
=3.6/3
=1.2
3又5/8*5又1/5+5又1/5*6又3/8
=5.2*(3又5/8+6又3/8)
=5.2*10
=52
[3/4-7/8/(5/6+4/5)]*28
=[3/4-7/8÷49/30]*28
=[3/4-15/28]*28
=3/4*28-15/28*28
=21-15
=6
(1.25*4/5-0.76)/(1又3/8+1又1/40)
=(1-0.76)/2.4
=0.24/2.4
=0.1
[(0.2+1/3)*4.5]/(8又1/20-6.45)
=8/15*4.5/1.6
=2.4/1.6
=1.5
x+3又2/3=5
x*9又3/4=7又1/11 x/2/5=10
6又2/3-x=4.25 6.4*1.7+6又2/5*8.3
(4又6/7+1.75)/1又11/14+3又5/6
2.16-7x=0.06
1/2x-0.5=5又1/2
8.16-1.26/0.3*1.5
=8.16-4.2*1.5
=8.16-6.3
=1.86
8.4*[(1.2+3又1/3)/3.4-1/2]
=8.4*[68/16/3.4-1/2]
=8.4*[5/4-1/2]
=8.4*3/4
=6.3
5.8:x=3又1/2:7
3.5x=7*5.8
x=7/3.5*5.8
x=2*5.8
x=11.6
3/10*55-4x=14.5
16.5-4x=14.5
4x=2
x=0.2
19.38-4又7/8-5又1/8
=1.938-(4又7/8+5又1/8)
=19.38-10
=9.38
13又7/13-(6又3/5+3又7/13)
=13又7/13-3又7/13-6又3/5
=10-6又3/5
=3.4
1又3/4+[2又3/14-(2又3/14-1.875)]/2又1/12
=1又3/4-15/8*12/25
=1又3/4-9/10
=0.85
(9.4-8又2/5)/[(1.1+1/15)*1又7/18]
=1/[7/6*25/18]
=1÷175/108
=108/175
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