a) 2x + 3 = 4 b) 4x + 4 = 0 c) 5x = 0 d) ( x + 1 )( x + 2 ) = 0

0 bình luận về “a) 2x + 3 = 4 b) 4x + 4 = 0 c) 5x = 0 d) ( x + 1 )( x + 2 ) = 0”

1. a) 2x + 3 = 4

   ⇒ 2x= 1

   $\text{⇒ 1 : 2}$

   $\text{⇒ $\frac{1}{2}$ }$

   $\text{b) 4x + 4 = 0}$

   $\text{⇒ 4x= -4}$

   $\text{⇒ x= -1}$

   $\text{c) 5x = 0}$

   $\text{⇒ x= 0 : 5}$

   $\text{⇒ x= 0}$

   $\text{d) ( x + 1 )( x + 2 ) = 0}$

   $\text{⇒ \(\left[ \begin{array}{l}x= x+1=0\\x=x+2=0\end{array} \right.\) }$

   $\text{⇒\(\left[ \begin{array}{l}x=-1\\x=-2\end{array} \right.\) }$

                                              *Pretty’s On The Inside*                                                 

   Bình luận

2. `a,2x+3=4`

   `<=>2x=1`

   `<=>x= 1 : 2`

   `<=> x= 1/2`

   `b, 4x+4=0`

   `<=> 4x=-4`

   `<=> x=-1`

   `c, 5x=0`

   `x=0 : 5`

   `x=0`

   `d, (x+1)(x+2)=0`

   `<=>`\(\left[ \begin{array}{l}x+1=0\\x+2=0\end{array} \right.\) 

   `<=>`\(\left[ \begin{array}{l}x=-1\\x=-2\end{array} \right.\) 

      Vậy `x=-1` hoặc `x=-2`

   ~ Học tốt ~

   Bình luận