Question

Mn giúp mik vs

Answer 1

A-A-D-A

Answer 2

Câu 1: A

Câu 2: B

Câu 3: D

Câu 4: A

Answer 3

Câu 1:

\(\left\{{}\begin{matrix}3-x\ne0.\\x+2\ne0.\\x-3\ne0.\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x\ne3.\\x\ne-2.\\x\ne3.\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x\ne3.\\x\ne-2.\end{matrix}\right.\) \(\Rightarrow A.x\ne-2;x\ne3.\)

Câu 2:

\(\left[{}\begin{matrix}x-1=0.\\x+2=0.\\x-3=0.\\5x+10=0.\end{matrix}\right.\) \(\left[{}\begin{matrix}x=1.\\x=-2.\\x=3.\\x=-2.\end{matrix}\right.\) \(\Rightarrow A.4\) nghiệm.

Câu 3: 

\(\Delta ABC\sim\Delta MNP\left(c-g-c\right).\\ \Rightarrow\left\{{}\begin{matrix}\widehat{A}=\widehat{M}.\\\dfrac{AB}{MN}=\dfrac{AC}{MP}.\end{matrix}\right.\) \(\Rightarrow D.\)

Câu 4: 

\(\Delta ABC:BD\) là phân giác \(\widehat{B}.\)

\(\Rightarrow\dfrac{DA}{DC}=\dfrac{BA}{BC}.\\ \Rightarrow A.\)