1樓：新野旁觀者
2/3-7/8+1/3
=(2/3+1/3)-7/8
=1-7/8
=1/8
5/6-(3/7-1/6)
=(5/6+1/6)-3/7
=1-3/7
=4/7
1-1/3-2/3
=1-(1/3+2/3)
=1-1
=01+3/5-1/10
=1+6/10-1/10
=1+1/2
=1又1/2
3/8-12/13+5/8
=3/8+5/8-12/13
=1-12/13
=1/13
1-(1/2-3/4)
=1+3/4-2/4
=1+1/4
=5/4
1-1/2-1/4
=1/2-1/4
=2/4-1/4
=1/4
2/7-8/9+5/7
=(2/7+5/7)-8/9
=1-8/9
=1/9
2-1/4-3/4
=2-(1/4+3/4)
=2-1
=11/2-(3/8-1/2)
=1/2+1/2-3/4
=1-3/8
=5/8
3/7-5/8+4/7
=3/7+4/7-5/8
=1-5/8
=3/8
1/2-1/3+1/2
=1/2+1/2-1/3
=1-1/3
=2/3
3/4-(1/2-1/4)
=3/4+1/4-1/2
=1-1/2
=1/2
3/5+4/5-2/5
=7/5-2/5
=11/6-(3/4-5/6)
=1/6+5/6-3/4
=1-3/4
=1/4
1/9-(1/8-8/9)
=1/9+8/9-1/8
=1-1/8
=7/8
1/2-(3/5-1/2)
=1/2+1/2-3/5
=1-3/5
=2/5
2樓：巨集哥
13/8-7/19-12/19
=13/8-(7/19+12/19)
=13/8-1
=5/8
7/13+8/17+6/13+9/17
=(7/13+6/13)+(8/17+9/17)=1+1=2
3樓：熱情的小小
1/5+1/25+(1/6-3/5)
2. 7/36+5/6-2/9
3. 5/44-(7/30-2/11)+1/24. 1/2+1/3+1/4+1/5+1/65.
1+1/2+1/6+1/12+1/20+1/30+1/426. 2/35-3/5-6/7
7. 4/23+4/21+5/46-1/428. 1/7+1/77+1/777+1/77779. 5/6-3/4+7/9
10. 99/100+100/99
11. 22/5-4/47+34/55
12. 11/23+2/46-11/34
13. 1/2+2/3+3/4
14. 44/3+25/6
15. 1/5-2/3-4/7
16. 22/18+11/23-31/6
17. 2/5-4/(5+6+7)-2/718. 18/3-36/6+12/5
19. 8/9+1/7+2/27
20. 1/100+3/2-23/46
1/5+8/15+3/5=
1/6+2/8+24/5=
2/5+3/5-5/2=
25/6-2/5+2/8=
5/8+6/7+2/9=
1/2+1/3+1/4=
1/5+6/7+9/4=
1/5+1/8x2/7=
1/8-2/7x+3/9=
2/7+5/8-9/6=
2/8+2/9-2/7=
8/4+2/5-4/5=
1/6+2/8+24/5=
2/5+3/5-5/2=
25/6-2/5+2/8=
5/8+6/7+2/9=
1/2+1/3+1/4=
1/5+6/7+9/4=
1/5+5/6+5/5=
1/5+3/5-4/6=
1/6+4/6-1/9=
1/8-1/9+1/7=
4樓：祕蕾盧醜
1.某市舉辦一次數學競賽，設1、2、3等獎若干名。競賽結果：獲一二等獎的佔獲獎人數的五分之二，獲二三等獎的佔獲獎總人數的十分之九。獲一二三等獎的各佔獲獎總人數的幾分之幾
5樓：劉起雲雪賦
1，獎八分之五的分子加上10，要使分數的大小不變，分母應加多？2：13分之1的分子、分母同時加上多少後就可以約成3分之1！
6樓：奇蹟與我有關
2/1*2=1 3/1*3=1 3/2*3=2 3/1*6=2
4/3*8=6 5/3*20=12 7/3*14=6 8/7*40=35
4/3*16=12 9/5*27=15 2/1*30=15 12/7*24=14
30/1*30=1 51/9*102=18 19/9*76=36 4/9*8=18
5/8*90=144 99/98*99=98 3/14*6=28 7/1*28=4
10/1*90=9 5/3*105=63 19/7*38=14 5/1*25=5
8/19*16=38 61/60*122=120 7/2*28=8 6/1*48=8
9/7*18=14 25/7*100=28 9/5*81=45 8/9*16=18
11/14-3/14+1/8
=4.05-(2.8+0.7)
=0.55
4.05-2.8-0.7
=4.05-(2.8+0.7)
=0.55
212+198
=(200+12)+(100+98)
=200+12+100+98
=12+98+100+200
=110+100+200
=410
13.75-(3.75+6.48)
=13.75-3.75-6.48
=10-6.48
=3.52
（0.75*42.7+57.3-0.573*25）/3*7972
=(0.75*42.7+57.3*1-57.3*0.25)/3*7972
=[0.75*42.7+57.3(1-0.25)]/3*7972
=[0.75*42.7+57.3*0.75]/3*7972
=[(42.7+57.3)*0.75]/3*7972
=75/3*7972
=25*7972
=199300
3.45*0.6*2.8=3.45×2.8×0.6=5.796
4.02＋5.4＋0.98
=4.02+0.98+5.4
=5+5.4
=10.4
5.17－1.8－3.2
=5.17-（1.8+3.2）
=5.17-5
=0.17
13.75－(3.75＋6.48)
=13.75-3.75-6.48
=3.52
33*145+33*55
=(145+55)*33
=200*33
=6600
369*136-36*369
=100*369
=36900
193*51+193*49
=100*193
=19300
25*32
=25*4*8
=800
79*16+79*78+79*6
=(16+78+6)*79
=100*79
=7900
25*32
=25*4*8
=800
193*51+193*49
=100*193
=19300
369*136-36*369
=100*369
=36900
33*145+33*55
=(145+55)*33
=200*33
=6600
1.45+15×6= 135
2.250÷5×8=400
3.6×5÷2×4=60
4.30×3+8=98
5.400÷4+20×5= 200
6.10+12÷3+20=34
7.(80÷20+80)÷4=21
8.70+(100-10×5)=120
9.360÷40+10= 19
10.40×20-200= 600
11.（80-25）*2= 110
12.70+45=115
13.90×2÷3= 60
14.16×6÷3= 32
15.300×6÷9= 200
16.540÷9×7=420
17.30×20÷15= 20
18.400÷4×7= 700
19.（350-80）÷9= 30
20.160+70+50=280
21.18-64÷8= 10
22.42÷6+20=27
23.40-5×7= 5
24.80+60÷3=100
25.41+18÷2= 50
26.75-11×5= 20
27.42+7-29= 20
28.5600÷80=70
29.25×16÷4= 100
30.120×25÷5= 600
31.36×11÷3= 132
32.1025÷25×8=328
33.336+70-6= 400
34.25×9×4= 900
35.200-33×3= 101
36.3020-1010=2010
37.12×50+10= 610
38.25×8+199= 399
39.23×11-13= 240
40.125÷25-5=0
41.4200-2200+200=2200
42.220+80-150=150
43.20×8×5= 800
44.600-3×200=0
45.20+20÷2= 30
46.35-25÷5= 30
47.36+8-40= 4
1）25%*132+1/4*8 2)32*0.125*25
=1/4*132+1/4*8 =(4+8)*0.125*25
=1/4*(132+8) =(4*25)*(8*0.125)
=1/4*140 =100*1
=35 =1000
3)75%*76+25*4+0.75*12
=3/4*76+3/4*12+25*4
=3/4*88+100
=166
4)3200*1/8÷2/5+1270 5)(2/3+4/5)*7/6
=400*5/2+1270 =22/15*7/6
=1000+1270 =77/45
=2270
5)6*(1/2+2/3) 6)132*(44÷176)
=6*1/2+6*2/3 =132*1/4 =33
=3+4
=7 7)72.25%*99+75.25%
=75.25%*99+75.25%*1
=75.25%*(99+1)
=75.25%*100
=75.25
①2700×（506－499）÷900 ②33.02－（148.4－90.85）÷2.5
=2700×7÷900 =33.02－57.55÷2.5
=18900÷900 =33.02－23.02
=21 =10
③（1÷1－1）÷5.1 ④18.1＋（3－0.299÷0.23）×1
=（1－1）÷5.1 =18.1＋1.7x1
=0÷5.1 =18.1＋1.7
=0 =19.8
/ =除號 *=乘號
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