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a: \(=\dfrac{1}{3}\cdot\dfrac{1}{3}\cdot\dfrac{-17}{18}\cdot\dfrac{14}{17}=\dfrac{-14}{18\cdot9}=\dfrac{-14}{162}=\dfrac{-7}{81}\)
b: \(=\dfrac{12}{4}+\dfrac{35}{11}\cdot\dfrac{121}{245}=3+\dfrac{11}{7}=\dfrac{32}{7}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
a: \(=\dfrac{15}{135}\cdot\dfrac{-17}{18}\cdot\dfrac{14}{17}=\dfrac{1}{9}\cdot\dfrac{-7}{9}=\dfrac{-7}{81}\)
b: \(=3+\dfrac{35}{11}\cdot\dfrac{121}{245}=3+\dfrac{11}{7}=\dfrac{32}{7}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
\(1)\frac{12}{7}\times \frac{7}{4}+\frac{35}{11}:\frac{245}{121}\)
\(=3+\frac{35}{11}\times \frac{121}{245}\)
\(=3+\frac{11}{7}\)
\(= 3\frac{1}{7}(=\frac{22}{7})\)
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= 65 x ( 121 + 11) - 35 x ( 17 + 115 )
= 65 x 132 - 35 x 132
= ( 65 - 35) x 132
= 30 x 132
= 3960
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`A)15/9=(5 xx 3)/(3 xx 3)=5/3`
`60/(-96)=(5 xx 12)/(12 xx (-8))=-5/8`
`=>5/3=15/9`
Ta thấy trừ cặp `5/3=15/9` thì còn lại không bằng nhau.
`B)60/(-85)=(5 xx 12)/(5 xx (-17))=-12/17`
`-77/56=(7 xx (-11))/(8 xx 7)=-11/8`
`=>-12/17=60/(-85)`
Ta thấy trừ cặp `-12/17=60/(-85)` thì còn lại không bằng nhau.
a) \(\dfrac{15}{9}=\dfrac{5}{3}\)
b) \(-\dfrac{12}{17}=\dfrac{60}{-85}\)
![](https://rs.olm.vn/images/avt/0.png?1311)
3/11-121/35:3/7
=3/11-121/15
=-1286/165
chúc bạn học tốt !!!
\(\frac{3}{11}-\frac{121}{35}:\frac{3}{7}\)
\(=\frac{3}{11}-\frac{121}{15}\)
\(=-\frac{1286}{165}\)
Hok Tốt !
# mui #
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\frac{121}{35}:\frac{11}{245}=\frac{11\cdot2\cdot7\cdot7\cdot5}{7\cdot5\cdot11}=14\)
121/35 : 11/245 = 121/35 x 245/11 = ...