Question

b) 17x – ( -16x – 37) = 2x + 43

c) -2x –3. (x – 17) = 34 – 2(-x + 25)

d) (-x - 6) (x + 9) = 0

Answer 1

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Answer 2

b) 17x – ( -16x – 37) = 2x + 43

-> 33x +37 =2x +43

->31x=6 

-> x= 6/31

c) -2x –3. (x – 17) = 34 – 2(-x + 25)

->-5x + 51= 2x-16

->7x= 67

x= 67/7

d) (-x - 6) (x + 9) = 0

  Ta có (-x-6)= 0 hoặc (x+9)=0

-> x=-6 hoặc x=-9

Answer 3

b) 17x – ( -16x – 37) = 2x + 43

\(\Leftrightarrow\)17x+16x+37=2x+43

\(\Leftrightarrow\)33x+37-2x-43=0

\(\Leftrightarrow\)31x=6

\(\Leftrightarrow\)x=31/6

c) -2x –3. (x – 17) = 34 – 2(-x + 25)

\(\Leftrightarrow\)-2x-3x-51=34+2x-50

\(\Leftrightarrow\)-5x-51=-16+2x

\(\Leftrightarrow\)-5x-51+16-2x=0

\(\Leftrightarrow\)-7x=35

\(\Leftrightarrow\)x=-5

d) (-x - 6) (x + 9) = 0

\(\hept{\frac{-x-6=0}{x+9=0}}\Leftrightarrow\)\(\hept{\begin{cases}x=-6\\x=-9\end{cases}}\)

Answer 4

Trả lời:

b, 17x - ( - 16x - 37 ) = 2x + 43

=> 17x + 16x + 37 = 2x + 43

=> 33x + 37 = 2x + 43

=> 33x - 2x = 43 - 37

=> 31x = 6

=> x = 6/31

Vậy x = 6/31

c, - 2x - 3 ( x - 17 ) = 34 - 2 ( - x + 25 )

=> - 2x - 3x + 51 = 34 + 2x - 50

=> - 5x + 51 = -16 + 2x

=> -5x - 2x = -16 - 51

=> -7x = -67

=> x = 67/7

Vậy x = 67/7

d, ( - x - 6 ) ( x + 9 ) = 0

=> - x - 6 = 0 hoặc x + 9 = 0

=> - x = 6                x= -9

=> x = -6

Vậy x = -6; x = -9