Câu hỏi của DIVISION BY ZERO

a) Đúngb) \(v_{13}=35\left(km/h\right);v_{23}=27\left(km/h\right)\)\(v_{12}=v_{13}-v_{23}=35-27=8\left(km/h\right)\)\(\Rightarrow\) Đúngc) \(s_1=35t;s_2=20+27t\)Để 2 xe gặp nhau \(s_1=s_2\Leftrightarrow35t=20+27t\Leftrightarrow8t=20\Leftrightarrow t=2,5\left(h\right)\)\(\Rightarrow\) Đúngd) \(s_A=s_1=35t=35.2.5=87,5\left(km\right)\)\(s_B=s_2=20+27t=20+27.2,5=87,5\left(km\right)\)\(\Rightarrow\) ĐúngCâu trả lời: a) Đúngb) \(v_{13}=35\left(km/h\right);v_{23}=27\left(km/h\right)\)\(v_{12}=v_{13}-v_{23}=35-27=8\left(km/h\right)\)\(\Rightarrow\) Đúngc) \(s_1=35t;s_2=20+27t\)Để 2 xe gặp nhau \(s_1=s_2\Leftrightarrow35t=20+27t\Leftrightarrow8t=20\Leftrightarrow t=2,5\left(h\right)\)\(\Rightarrow\) Đúngd) \(s_A=s_1=35t=35.2.5=87,5\left(km\right)\)\(s_B=s_2=20+27t=20+27.2,5=87,5\left(km\right)\)\(\Rightarrow\) Đúng