1楼:数学新绿洲
18÷﹙3.2-
1.7﹚-1.5
=18÷1.5 - 1.5
=18÷(3/2) - 1.5
=18×(2/3) - 1.5
=12 - 1.5
=10.5
4/5-﹙4/5+1/4﹚÷3
=4/5-﹙16/20 + 5/20﹚×(1/3)=4/5-﹙21/20﹚×(1/3)
=16/20 - 7/20
=9/20
5/9+8/15÷3/10-1/6
=5/9+ 8/15×(10/3)-1/6=5/9+ 16/9-1/6
=21/9 - 1/6
=7/3 - 1/6
=14/6 - 1/6
=13/6
=2又1/6
12÷4/5+6/7×1/3 4/7×3/10÷(1/5-1/7)(1/18+1/3-1/6)÷1/9 (0.875-5/16)×(10/9+2/3)
2楼:自由的数学鸟
1题:12÷4/5+6/7×1/3
=12×5/4+6/7×1/3
=15+2/7
=15又2/7
2题:4/7×3/10÷(1/5-1/7)=4/7×3/10÷(7/35-5/35)=4/7×3/10÷2/35
=4/7×3/10×35/2
=33题:(1/18+1/3-1/6)÷1/9=(1/18+6/18-3/18)×9
=(2/9)×9
=24题:(0.875-5/16)×(10/9+2/3)=(7/8-5/16)×(10/9+6/9)=(14/16-5/16)×16/9
=9/16×16/9=1
3楼:芭娜娜
12÷4/5+6/7×1/3 =18+2/7 =128/7
简便算∶4又3/4÷5/18-3.6+6.25+3又3/5 100
4楼:妙酒
您好:4又3/
4÷5/18-3.6+6.25+3又3/5
=19/4÷5/18-3.6+3.6+6.25
=17.1+6.25
=23.35
41又1/3×3/4+51又1/4×4/5+61又1/5×5/6
=124/3x3/4+205/4x4/5+306/5x5/6
=31+41+51
=123
7/15×3/8+1/15×7/16+1/15×3又1/2
=7/15x3/8+7/15x1/16+7/15x1/2
=7/15x(3/8+1/16+1/2)
=7/15x(6/16+1/16+8/16)
=7/15x15/16
=7/16
1又3/7×﹙3又1/13+1又9/11﹚×0.7×28又3/5
=10/7x7/10x143/5x(40/13+20/11)
=143/5x40/13+143/5x20/11
=88+52
=140
2012×2010/2011
=2011x2010/2011+1x2010/2011
=2010+2010/2011
=2010又2010/2011
1997×0.3/1999×0.5+1.2/1999
=1001×2又3/11+998÷998又998/999﹢9又1/1000
=1001x24/11+998÷(998x(1+1/999))+9又1/1000
=2184+999/1000+9又1/1000
=2184+10
=2194
3/2+5/6+7又7/12+4又9/20+13又11/30+6又13/42
=(7+4+13+6)+1+1/2+1/2+1/3+1/3+1/4+1/4+1/5+1/5+1/6+1/6+1/7
=30+1+1+2/3+1/2+2/5+1/3+1/7
=32+1+1/2+2/5+1/7
=33+35/70+28/70+10/70
=34又3/70
1/3+3/4+2/5+5/7+7/8+9/20+10/21+11/24+19/35
=(1/3+3/4+7/8+11/24)+(2/5+9/20)+(5/7+10/21+19/35)
=(8/24+18/24+21/24+11/24)+(8/20+9/20)+(75/105+50/105+57/105)
=29/12+17/20+26/15
=145/60+51/60+104/60
=300/60
=5﹙1/2+1/6+1/12+1/20+1/30+1/42+1/56﹚÷1又1/7
=(1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8)÷8/7
=(1-1/8)x7/8
=7/8x7/8
=49/64
如果本题有什么不明白可以追问,如果满意记得采纳
如果有其他问题请另发或点击向我求助,答题不易,请谅解,谢谢。
祝学习进步!
5楼:匿名用户
4x^4+4x+4=5x
x^4+x +1=5/4x
x/(x^4+x+1)=4/5
3/10÷20= 9÷3/4= 5/8×1/4= 6/11×5/12= 5/9-1/6= 2/3÷4/7= 1/8+3/4= 5/6÷5/7= 先化简再求比值 21:49
6楼:白日衣衫尽
3/10÷20=3/200
9÷3/4= 9x4/3=12
5/8×1/4=5/32
6/11×5/12=1/11x5/2=5/22
5/9-1/6=10/18-3/18=7/18
2/3÷4/7= 2/3x7/4= 14/12=7/6
1/8+3/4= 1/8+6/8= 7/8
5/6÷5/7=5/6x7/5=7/6
21:49=7x3:7x7=3:7=3/7
1.6:2.4=0.8x2: 0.8x3= 2: 3=2/3
2.4/8=0.3x8/8=0.3
3/7:2/9= 3/7x9/2=27/14
9/7-8/19-11/19=9/7-(8/19+11/19)=9/7-1=2/7
5/12÷8+1/8×7/12 =5/12x1/8+1/8×7/12=(1/8)x(5/12+7/12)=(1/8)x1=1/8
解方程6x-2.4=0.36 ,6x=0.36+.2.4,6x=2.76, x=0.46
5x÷15=15 , x÷5=15, x=15*5, x=75
8x-0.5x=30,7.5x=30, x=4
计算。1.[13/5+2.4×(5/3)-1.5]÷1.1 2.16/7÷8/35+4.375×8/7 3.[33/10-﹙11.9-8.4×4/3﹚]÷130%
7楼:紫兰风云
[13/5+2.4×(5/3)-1.5]÷1.1=[13/5+4-1.5]÷1.1
=[2.6+4-1.5]÷1.1
=5.1÷1.1
=51/11
16/7÷8/35+4.375×8/7
=16/7×35/8+35/8×8/7
=10+5
=15[33/10-﹙11.9-8.4×4/3﹚]÷130%=[3.3-11.9+11.2]÷1.3
=2.6÷1.3=2
8楼:仪少爷
[13/5+2.4×(5/3)-1.5]÷1.1=[13/5+(24/10)*(5/3)-1.5]/1.1=[2.6+4-1.5]/1.1
=5.1/1.1=51/11
16/7÷8/35+4.375×8/7
=16/7*(35/8)+4又3/8*(8/7)=10+35/8*(8/7)
=10+5=15
[33/10-﹙11.9-8.4×4/3﹚]÷130%=[3.
3-(11.9-2.8*4)]/130%=[3.
3-(11.9-11.2)]/130%=[3.
3-0.7]/130%
=2.6/1.3=2
要简便算法,过程 1:8/9×(9+3/4)-2/3 2:7/8÷2/3+7/8×1/2 3:4-2/5÷8/15-1/4
9楼:
1:8/9×(
9+3/4)-2/3=8/9×9+8/9×3/4-2/3=8+2/3-2/3=8 2:7/8÷2/3+7/8×1/2=7/8×3/2+7/8×1/2=7/8×(3/2+1/2)=7/8×2=7/4 3:4-2/5÷8/15-1/4=4-2/5×15/8-1/4=4-3/4-1/4=4-(3/4+1/4)=4-1=3 4:
7/8+2/3÷4/5+1/6=7/8+2/3×5/4+1/6=7/8+5/6+1/6=7/8+1=15/8 5: 6-5/12×9/10-13/8 =6-3/8-13/8=6-(3/8+13/8)=6-2=4 6: 4/5+5/8÷1/4+1/2=4/5+5/8×4+1/2=4/5+5/2+1/2=4/5+3=19/5 7:
2-8/9×3/4-1/3=2-2/3-1/3=2-(2/3+1/3)=2-1=1 10: 4/9+2/7+5/18÷1/2=4/9+2/7+5/18×2=4/9+2/7+5/9=4/9+5/9+2/7=1+2/7=9/7 11:4-8/15÷2/3-1/5=4-8/15×3/2-1/5=4-4/5-1/5=4-(4/5+1/5)=4-1=3 口算的,你回去检验下吧
10楼:匿名用户
8/9×(9+3/4)-2/32=8/9*9+8/9*3/4-1/16=8+(2/3-1/16)=8又29/48
11楼:匿名用户
7/8+2/3*5/4+1/6=7/8+5/6+1/6=15/8
12楼:含黙兮攸语
我x,这个还要简便方法。我砸觉得直接算就是最简便的、。、、
(1-5/4*5/3)/25/9 简便计算
13楼:匿名用户
1﹚2分之1+6分之1+12分之1+20分之1+30分之1+42分之1+56分之1
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5……+1/7-1/8=1-1/8=7/8
2﹚15.8-18分之7+14.2-18分之1=15.8+14.2-﹙18分之7+18分之11﹚=30-1=29
3﹚(1.5+2又3分之2)/3.75-3分之2=﹙3/2+8/3﹚×4/15-2/3
=2/5+32/45-30/45
=20/45=4/9
(1-5/4*5/3)/25/9
=9/25-25×9/﹙4×3×25﹚
=36/100-75/100
=﹣39/100
14楼:兖矿兴隆矿
=(1-25/12)*9/25
=9/25-3/4
=(36-75)/100
=-39/100
2分之1+6分之1+12分之1+20分之1+30分之1+42分之1+56分之1
=1-1/8
=7/8
15.8-18分之7+14.2-18分之11=30-(7+11)/18
=30-1
=29(1.5+2又3分之2)/3.75-3分之2=(1.5+8/3)/3.75-2/3
=25/6*4/15-2/3
=10/9-2/3
=4/9
13÷﹛4分之1﹢6分之5﹜×4分之3= 9分之8×[4分之3-﹙16分之7-4分之1﹚]=
15楼:忆昔
13÷﹛4分之1﹢6分之5﹜×4分之3
=13÷(3/12+10/12﹚×3/4
=13÷13/12×3/4
=13×12/13×3/4
=12×3/4
=3×3
=8/9×﹙12/16-3/16﹚
=8/9×9/16
=8/16
=1/2
[1-﹙8分之3﹢4分之1﹚]×39分之2=[1-﹙3/8﹢2/8﹚]×2/39
=﹙1-5/8﹚×2/39
=﹙8/8-5/8﹚×2/39
=3/8×2/39
=3/39×2/8
=1/13×1/4
=1/52
3分之2+﹙5分之4-3分之2)×3分之5=2/3+﹙12/15-10/15)×5/3=2/3+2/15×5/3
=2/3+2/9
=6/9+2/9
=7/9
[1-﹙4分之1+8分之3﹚]÷4分之1
=[1-﹙2/8+3/8﹚]÷1/4
=﹙1-5/8﹚÷1/4
=﹙8/8-5/8﹚÷1/4
=3/8×4/1
=3/2
=20/20×6/9×11/111
=2/3×11/111
=22/333
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