\(\left(3x+2\right)\left(2x+9\right)-\left(x+2\right)\left(6x+1\right)=x+1-\left(x-9\right)\)

\(\Rightarrow6x^2+27x+4x+18-6x^2-x-12x-2=10\)

\(\Rightarrow18x+16=10\)

\(\Rightarrow18x=-6\)

\(\Rightarrow x=-\frac{6}{18}=-\frac{1}{3}\)

cam on 

không có đề bài à

c1 là cm hai cai dó bằng nhau 

c2 c3 là rút gọn bt

 (3x+2)(2x+9)-(x+2)(6x+1)=(x+1)-(x-6)
<=>6x^2+27x+4x+18-(6x^2+x+12x+2)=x+1-x+6
<=>6x^2+27x+4x+18-6x^2-x-12x-2 = 7
<=>18x+16=7

<=>18x=-9

<=>x=-0,5

`@` `\text {Ans}`

`\downarrow`

`a)`

`3x(4x-1) - 2x(6x-3) = 30`

`=> 12x^2 - 3x - 12x^2 + 6x = 30`

`=> 3x = 30`

`=> x = 30 \div 3`

`=> x=10`

Vậy, `x=10`

`b)`

`2x(3-2x) + 2x(2x-1) = 15`

`=> 6x- 4x^2 + 4x^2 - 2x = 15`

`=> 4x = 15`

`=> x = 15/4`

Vậy, `x=15/4`

`c)`

`(5x-2)(4x-1) + (10x+3)(2x-1) = 1`

`=> 5x(4x-1) - 2(4x-1) + 10x(2x-1) + 3(2x-1)=1`

`=> 20x^2-5x - 8x + 2 + 20x^2 - 10x +6x - 3 =1`

`=> 40x^2 -17x - 1 = 1`

`d)`

`(x+2)(x+2)-(x-3)(x+1)=9`

`=> x^2 + 2x + 2x + 4 - x^2 - x + 3x + 3=9`

`=> 6x + 7 =9`

`=> 6x = 2`

`=> x=2/6 =1/3`

Vậy, `x=1/3`

`e)`

`(4x+1)(6x-3) = 7 + (3x-2)(8x+9)`

`=> 24x^2 - 12x + 6x - 3 = 7 + (3x-2)(8x+9)`

`=> 24x^2 - 12x + 6x - 3 = 7 + 24x^2 +11x - 18`

`=> 24x^2 - 6x - 3 = 24x^2 + 18x -11`

`=> 24x^2 - 6x - 3 - 24x^2 + 18x + 11 = 0`

`=> 12x +8 = 0`

`=> 12x = -8`

`=> x= -8/12 = -2/3`

Vậy, `x=-2/3`

`g)`

`(10x+2)(4x- 1)- (8x -3)(5x+2) =14`

`=> 40x^2 - 10x + 8x - 2 - 40x^2 - 16x + 15x + 6 = 14`

`=> -3x + 4 =14`

`=> -3x = 10`

`=> x= - 10/3`

Vậy, `x=-10/3`

Hello các bạn còn đó ko?

(3x+2)(2x+9)-(x+2)(6x+1)=(x+1)-(x-6)

<=>(6x²+27x+4x+18)-(6x²+x+12x+2)=x+1-x+6

<=>6x²+31x+18-6x²-13x-2=7

<=>18x+16=7

<=>18x=-9

<=>x=-1/2

Đề bài yêu cầu gì bạn?