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a) \(\dfrac{11\cdot8-11\cdot3}{17-6}\)
\(=\dfrac{11\cdot\left(8-3\right)}{11}=5\)
b) \(\dfrac{24-12\cdot13}{12+4\cdot9}\)
\(=\dfrac{12\cdot\left(2-13\right)}{12\left(1+3\right)}=\dfrac{-11}{4}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{24-12.13}{12+4.9}=\frac{24-156}{12+36}=\frac{-132}{48}=\frac{-11}{4}\)
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Rút gọn phân số:
\(\frac{24-12.13}{12+4.9}=\frac{24-4.3.13}{12+4.9}=\frac{24-3.13}{12+9}=\frac{24-3.13}{12+3.3}=\frac{24-13}{12+3}=\frac{11}{14}\)
Sai thì thôi nhé!
\(\frac{24-12.13}{12+4.9}\)=\(\frac{24-156}{12+36}\)=\(\frac{-132}{48}\)=-\(\frac{11}{4}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{24-12.13}{12+4.9}=\frac{12.2-12.13}{4.3+4.9}\frac{12.\left(2-13\right)}{4.\left(3+9\right)}=\frac{3.\left(-11\right)}{12}=\frac{-11}{4}\)
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