TÍNH ; (2+5)-(-1-4) ; +6-(-1+30) ; +8-(-3+1) ; 10+(4-1) ; (3+1)-(2-1) “ TÌM X : (2X-1) .(2X)=0

0 bình luận về “TÍNH ; (2+5)-(-1-4) ; +6-(-1+30) ; +8-(-3+1) ; 10+(4-1) ; (3+1)-(2-1) “ TÌM X : (2X-1) .(2X)=0”

1. Giải thích các bước giải:

   Tính
   `(2+5)-(-1-4)`
   `=7+5`
   `=12`
   `+6-(-1+30)`
   `=6+1-30`
   `=7-30`
   `=-23`
   `+8-(-3+1)`
   `=8+3-1`
   `=11-1`
   `=10`
   `10+(4-1) `
   `=10+3`
   `=13`
   `(3+1)-(2-1)`
   `=4-1`
   `=3`
   Tìm `x`
   `(2x-1).(2x)=0`
   `=>`\(\left[ \begin{array}{l}2x-1=0\\2x=0\end{array} \right.\) 
   `=>`\(\left[ \begin{array}{l}2x=1\\x=0\end{array} \right.\) 
   `=>`\(\left[ \begin{array}{l}x=\dfrac{1}{2}\\x=0\end{array}\right .\)
   ` (3x-6).x=0`
   `=>`\(\left[ \begin{array}{l}3x-6=0\\x=0\end{array} \right.\) 
   `=>`\(\left[ \begin{array}{l}3x=6\\x=0\end{array} \right.\) 
   `=>`\(\left[ \begin{array}{l}x=2\\x=0\end{array} \right.\) 
   `2x.(3x+1)=0`
   `=>`\(\left[ \begin{array}{l}2x=0\\3x+1=0\end{array} \right.\) 
   `=>`\(\left[ \begin{array}{l}x=0\\3x=-1\end{array} \right.\) 
   `=>`\(\left[ \begin{array}{l}x=0\\x=\dfrac{-1}{3}\end{array} \right.\) 
   ` (5x-1).(2x+1)=0`
   `=>`\(\left[ \begin{array}{l}5x-1=0\\x=2x+1=0\end{array} \right.\) 
   `=>`\(\left[ \begin{array}{l}5x=1\\2x=-1\end{array} \right.\) 
   `=>`\(\left[ \begin{array}{l}x=\dfrac{1}{5}\\x=\dfrac{-1}{2}\end{array} \right.\) 
   `(8x+3).(x+1)=0`
   `=>`\(\left[ \begin{array}{l}8x+3=0\\x+1=0\end{array} \right.\) 
   `=>`\(\left[ \begin{array}{l}8x=-3\\x=-1\end{array} \right.\) 
   `=>`\(\left[ \begin{array}{l}x=\dfrac{-3}{8}\\x=-1\end{array} \right.\) 

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2. Đáp án:

   Bài 1:

   (2+5)-(-1-4)

   = 7 – (-5)

   = 7 + 5

   = 12

   6 – (-1+30) 

   = 6 – 29

   = – 23

   8 – (-3+1)

   = 8 – (-2)

   = 8 + 2

   = 10

   10 + (4-1)

   = 10 + 3

   = 13

   (3+1)-(2-1)

   = 4 – 1

   = 3

   Bài 2:

   (2x – 1). 2x = 0

   <=> 2x-1=0 <=> 2x=1 <=> 2x=1

   hoặc 2x=0 <=> x =0

   (3X-6).X=0

   <=> 3x-6=0 <=> 3x=6 <=> x=2

   hoặc x=0

   2X.(3X+1)=0

   <=> 2x=0 <=> x=0

   hoặc 3x+1=0 <=> 3x=-1 <=> x=-1/3

   (5X-1).(2X+1)=0

   <=> 5x-1=0 <=> 5x=1 <=> x=1/5

   hoặc 2x+1=0 <=> 2x=-1 <=>x=-1/2

   (8X+3).(X+1)=0 

   <=> 8x+3=0 <=> 8x=-3 <=> x=-3/8

   hoặc x+1=0 <=> x=-1

    Gửi bạn nhéeeee 

   Nhớ vote cho mình nhaaaa ❤❤

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