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a)2/5+3/4
=23/20
b)2/5 + 3/10-1/2
=7/10-1/2
=1/5
c)8/11+8/33x3/4
=8/11 + 2/11
=10/11
tick cho mik nha mik cháy đen túi r
hok tốt
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\(\dfrac{11}{12}\times\dfrac{6}{9}-\dfrac{3}{8}=\dfrac{11}{18}-\dfrac{3}{8}=\dfrac{17}{72}\)
\(\dfrac{5}{7}:\dfrac{9}{14}-\dfrac{17}{18}=\dfrac{10}{9}-\dfrac{17}{18}=\dfrac{3}{18}=\dfrac{1}{6}\)
11/12 x 6/9 - 3/8
= 11/18 - 3/8
= 17/72
5/7 : 9/14 - 17/18
= 10/9 - 17/18
= 1/6
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gọi các số đó là x
quy đồng \(\frac{11}{8}\) = \(\frac{11\times7}{8\times7}\) = \(\frac{77}{56}\)
\(\frac{11}{7}\) = \(\frac{11\times8}{7\times8}\) = \(\frac{88}{56}\)
vậy \(x\in\) {\(\frac{39}{28}\) ; \(\frac{79}{56}\) ; \(\frac{10}{7}\) ; \(\frac{81}{56}\) ; \(\frac{41}{28}\) ; \(\frac{83}{56}\) ; \(\frac{3}{2}\) ; \(\frac{85}{56}\) ; \(\frac{43}{28}\) ; \(\frac{87}{56}\) ; \(\frac{11}{7}\)}
lưu ý: nhưng phân trên là những phân số tối giản
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\(=\dfrac{8}{5}+\dfrac{18+2-14-6}{11}+\dfrac{8}{5}=\dfrac{16}{5}\)
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3/5*8 + 3/8*11 + ... + 3/17*20
= 1/5 - 1/8 + 1/8 - 1/11 + ... + 1/17 - 1/20
= 1/5 - 1/20
= 3/20
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a)\frac{11}{8}-\frac{7}{8}+\frac{3}{4}=\frac{4}{8}+\frac{3}{4}=\frac{2}{4}+\frac{3}{4}=\frac{5}{4}\)
\(b)\frac{24}{8}-\frac{5}{8}-3=(\frac{24}{8}-3)-\frac{5}{8}=3-3-\frac{5}{8}=-\frac{5}{8}\)
\(c)\)Tự làm
\(d)56\cdot78+8634=4368+8634=13002\)
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\(\dfrac{8}{11}+\dfrac{8}{33}\times\dfrac{3}{4}=\dfrac{8}{11}+\dfrac{2}{11}=\dfrac{8+2}{11}=\dfrac{10}{11}\)
\(\dfrac{8}{11}+\dfrac{4.2}{11.3}.\dfrac{3}{4}=\dfrac{8}{11}+\dfrac{2}{11}=\dfrac{10}{11}\)
quy đồng nha bạn
8/11 - 3/8 = 64/88 - 33/ 88 = 31/88
ủng hộ nha
8/11 - 3/8 = 31/88