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`212`
`a, 1/3-1/4=4/12 - 3/12=1/12`
`b, 1/4 -1/5=5/20-4/20=1/20`
`c,7/9-1/4=28/36-9/36=19/36`
`d, 6/7-3/10=60/70- 21/70=39/70`
`e,5/9-1/4= 20/36 -9/36= 11/36`
`g, 5/8-2/5=25/40 -16/40= 9/40`
`213`
`a,1-1/2=2/2-1/2=1/2`
`b,1-3/10=10/10-3/10=7/10`
`c, 3-1/3=9/3-1/3=8/3`
`d,4-1/9=36/9-1/9=35/9`
`e,8-2/3= 24/3-2/3=22/3`
`g,5-2/5=25/5-2/5=23/5`
`@ yL`
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a: 6/5-2/3=18/15-10/15=8/15
b: 9/7-5/8=72/56-35/56=37/56
c: 7/6-3/4=14/12-9/12=5/12
d: 9/8-8/9=81/72-64/72=17/72
e: 7/5-7/6=7(1/5-1/6)=7/30
f: 3/4-2/5=15/20-8/20=7/20
g: 4/7-5/6=24/42-35/42=-11/41
i: 6/13-5/11=66/143-65/143=1/143
k: 1-4/5=1/5
m: 2-5/9=18/9-5/9=13/9
n: 3-9/5=15/5-9/5=6/5
p: 4-3/4=16/4-3/4=13/4
a) \(\dfrac{6}{5}-\dfrac{2}{3}=\dfrac{18}{15}-\dfrac{10}{15}=\dfrac{8}{15}\)
b) \(\dfrac{9}{7}-\dfrac{5}{8}=\dfrac{72}{56}-\dfrac{35}{56}=\dfrac{37}{56}\)
c) \(\dfrac{7}{6}-\dfrac{3}{4}=\dfrac{28}{24}-\dfrac{18}{24}=\dfrac{10}{24}=\dfrac{5}{12}\)
d) \(\dfrac{9}{8}-\dfrac{8}{9}=\dfrac{81}{72}-\dfrac{64}{72}=\dfrac{17}{72}\)
e) \(\dfrac{7}{5}-\dfrac{7}{6}=\dfrac{42}{30}-\dfrac{35}{30}=\dfrac{7}{30}\)
h) \(\dfrac{4}{7}-\dfrac{5}{6}=\dfrac{24}{42}-\dfrac{35}{42}=-\dfrac{11}{42}\)
i) \(\dfrac{6}{13}-\dfrac{5}{11}=\dfrac{66}{143}-\dfrac{65}{143}=\dfrac{1}{143}\)
k) \(1-\dfrac{4}{5}=\dfrac{5}{5}-\dfrac{4}{5}=\dfrac{1}{5}\)
m) \(2-\dfrac{5}{9}=\dfrac{18}{9}-\dfrac{5}{9}=\dfrac{13}{9}\)
n) \(3-\dfrac{9}{5}=\dfrac{15}{5}-\dfrac{9}{5}=\dfrac{6}{5}\)
p) \(4-\dfrac{3}{4}=\dfrac{16}{4}-\dfrac{3}{4}=\dfrac{13}{4}\)
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Sau ngày thứ nhất, kho còn số gạo là :
200 - 40 = 160 ( tạ gạo )
Ngày thứ hai bán được số gạo là :
160 : ( 2 + 3 ) x 2 = 64 ( tạ gạo )
Ngày thứ ba bán được số gạo là :
160 - 64 = 96 ( tạ gạo )
Đáp số : Ngày thứ nhất : 40 tạ gạo
Ngày thứ hai : 64 tạ gạo
Ngày thứ ba : 96 tạ gạo
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a: =1/3x7/5=7/15
b: =11/9x1/2=11/18
c: =1/3x3/4=1/4
d: =1/5x4/5=4/25
e: =2/3x1/4=2/12=1/6
f: =1/2x1/3=1/6
g: =1/3x1/2=1/6
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a:\(\dfrac{33}{44}=\dfrac{3}{4}\\ MSC:8\\ \dfrac{3}{4}=\dfrac{3\times2}{4\times2}=\dfrac{6}{8};\dfrac{2}{8}\)
b:\(\dfrac{9}{12}=\dfrac{3}{4};\dfrac{24}{36}=\dfrac{7}{9}\\ MSC:72\\ \dfrac{3}{4}=\dfrac{3\times18}{4\times18}=\dfrac{54}{72};\dfrac{7}{9}=\dfrac{7\times8}{9\times8}=\dfrac{56}{72};\dfrac{3}{8}=\dfrac{3\times9}{8\times9}=\dfrac{27}{72}\)
Bài `4`
`24/60= 6/15=2/5=8/20`
`42/54=7/9=14/18=21/27`
Bài `5`
`a,` \(\dfrac{4\times5\times3}{3\times7\times4}=\dfrac{5}{7}\)
`b,` \(\dfrac{7\times9\times11}{11\times7\times5}=\dfrac{9}{5}\)
Phần `1`
\(\dfrac{4}{14}\) tối giản
\(\dfrac{12}{15}=\dfrac{12:3}{15:3}=\dfrac{4}{5}\)
\(\dfrac{18}{54}=\dfrac{18:18}{54:18}=\dfrac{1}{3}\)
\(\dfrac{36}{45}=\dfrac{36:9}{45:9}=\dfrac{4}{5}\)
\(\dfrac{50}{70}=\dfrac{50:10}{70:10}=\dfrac{5}{7}\)
\(\dfrac{24}{120}=\dfrac{24:24}{120:24}=\dfrac{1}{2}\)
\(\dfrac{24}{36}=\dfrac{24:12}{36:12}=\dfrac{2}{3}\)
\(\dfrac{132}{55}=\dfrac{132:11}{55:11}=\dfrac{12}{5}\)
`2`
`a,`các phân số tối giản là : \(\dfrac{8}{11};\dfrac{4}{7}\)
`b,` phân số bằng \(\dfrac{3}{4}\) : \(\dfrac{45}{60};\dfrac{12}{16}\)
`3`
các phân số bằng nhau : \(\dfrac{18}{33}=\dfrac{6}{11}\) ; \(\dfrac{5}{7}=\dfrac{20}{28}\) ; \(\dfrac{8}{10}=\dfrac{12}{15}\) ; \(\dfrac{14}{21}=\dfrac{24}{36}\)