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a) = \(\left(\dfrac{2}{7}+\dfrac{4}{7}+\dfrac{1}{7}\right):\dfrac{27}{31}\)
= \(\dfrac{7}{7}\) x \(\dfrac{31}{27}\)
= 1 x \(\dfrac{31}{27}\) = \(\dfrac{31}{27}\)
b) = \(\left(\dfrac{23}{45}:\dfrac{23}{45}\right)\)x \(\dfrac{17}{51}\)
= 1 x \(\dfrac{17}{51}\)= \(\dfrac{17}{51}\)
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a) \(\dfrac{8}{9}< 1;\dfrac{13}{7}>1\Rightarrow\dfrac{8}{9}< \dfrac{13}{7}\)
b) \(\dfrac{16}{27}>\dfrac{15}{27}>\dfrac{15}{29}\Rightarrow\dfrac{16}{27}>\dfrac{15}{29}\)
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\(\frac{56}{78}\)\(=\)\(\frac{56.27}{78.27}\)\(=\)\(\frac{1512}{2106}\)
\(\frac{43}{27}\)\(=\)\(\frac{43.78}{27.78}\)\(=\)\(\frac{3354}{2106}\)
\(D\text{ấu}\)\(ch\text{ấm}\)\(ngh\text{ĩa}\)\(l\text{à}\)\(d\text{ấu}\)\(nh\text{â}n\).
tk nha bạn !
Mẫu số chung là 78x27=2106
\(\frac{56}{78}=\frac{56x27}{78x27}=\frac{1512}{2106}\)
\(\frac{43}{27}=\frac{43x78}{27x78}=\frac{3354}{2106}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{17}{45}+\frac{13}{45}+\frac{28}{45}+\frac{1}{27}+\frac{26}{27}+\frac{22}{45}\)
= \(\left(\frac{17}{45}+\frac{28}{45}\right)+\left(\frac{1}{27}+\frac{26}{27}\right)+\left(\frac{23}{45}+\frac{22}{45}\right)\)
= 1 + 1 + 1
= 3
2957:23=128 dư 13
198475:56=3544 dư 11
9285:27=343 dư 24
2957 : 23 = 128 dư 13
198475 : 56 = 3544 dư 11
9285 : 27 = 343 dư 24