Câu hỏi của đinh thị anh thư

Question

so sánh p/s sau :

-11/12 và 17/-18

subjects · Accepted Answer

quy đồng

$\dfrac{-11}{12}=\dfrac{\left(-11\right)\cdot3}{12\cdot3}=\dfrac{-33}{36}$

$\dfrac{17}{-18}=\dfrac{17\cdot2}{\left(-18\right)\cdot2}=\dfrac{34}{-36}=\dfrac{-34}{36}$

so sánh

$\Rightarrow\dfrac{-33}{36}>\dfrac{-34}{36}\
\Rightarrow\dfrac{-11}{12}>\dfrac{17}{-18}$Câu trả lời: quy đồng

$\dfrac{-11}{12}=\dfrac{\left(-11\right)\cdot3}{12\cdot3}=\dfrac{-33}{36}$

$\dfrac{17}{-18}=\dfrac{17\cdot2}{\left(-18\right)\cdot2}=\dfrac{34}{-36}=\dfrac{-34}{36}$

so sánh

$\Rightarrow\dfrac{-33}{36}>\dfrac{-34}{36}\
\Rightarrow\dfrac{-11}{12}>\dfrac{17}{-18}$