a) Ta có: \(\dfrac{5x+3}{2}+\dfrac{3x-8}{4}=4\)

\(\Leftrightarrow\dfrac{2\left(5x+3\right)}{4}+\dfrac{3x-8}{4}=4\)

\(\Leftrightarrow10x+6+3x-8=16\)

\(\Leftrightarrow13x-2=16\)

\(\Leftrightarrow13x=18\)

hay \(x=\dfrac{18}{13}\)

Vậy: \(x=\dfrac{18}{13}\)

b) Ta có: \(\dfrac{5x-6}{3}-\dfrac{5x+6}{12}=1\)

\(\Leftrightarrow\dfrac{4\left(5x-6\right)}{12}-\dfrac{5x+6}{12}=1\)

\(\Leftrightarrow20x-24-5x-6=12\)

\(\Leftrightarrow15x-30=12\)

\(\Leftrightarrow15x=42\)

hay \(x=\dfrac{14}{5}\)

Vậy: \(x=\dfrac{14}{5}\)

a: \(=20x^2-25x-20x^2+24x-30=-x-30\)

b: \(\Leftrightarrow12x-6x^2+6x^2-15x=12\)

=>-3x=12

hay x=-4

a) \(\Rightarrow72-20x-36x+84=30x-240-6x-84\)

\(\Rightarrow80x=480\Rightarrow x=6\)

b) \(\Rightarrow15x+25-8x+12=5x+6x+36+1\)

\(\Rightarrow4x=0\Rightarrow x=0\)

c) \(\Rightarrow10x-16-12x+15=12x-16+11\)

\(\Rightarrow14x=4\Rightarrow x=\dfrac{2}{7}\)

a ) 

\(5x\left(4x-5\right)-4x\left(5x-6\right)=30\)

\(\Rightarrow20x^2-25x-20x^2+24x=30\)

\(\Rightarrow-x=30\)

\(\Rightarrow x=-30\)

Vậy ...

b ) 

\(2x\left(6-3x\right)+3x\left(2x-5\right)=12\)

\(\Rightarrow12x-6x^2+6x^2-15x=12\)

\(\Rightarrow-3x=12\)

\(\Rightarrow x=-4\)

Vậy ...

a) \(5x\left(4x-5\right)-4x\left(5x-6\right)-30\)

\(\Rightarrow20x^2-25x-20x^2+24x=30\)

\(\Rightarrow-1x=30\)

\(\Rightarrow x=-30\)

Vậy x = -30

b) \(2x\left(6-3x\right)+3x\left(2x-5\right)=12\)

\(\Rightarrow12x-6x^2+6x^2-15x=12\)

\(\Rightarrow-3x=12\)

\(\Rightarrow x=-4\)

Vậy x = -4

cảm ơn các bạn nếu đc các bạn có thể trả lời hết số câu hỏi tớ vừa hỏi có đc ko ạ

a)x²-5x+6=(x²-2x)-(3x-6)=x(x-2)-3(x-2)(=(x-2)(x-3)

b)x²+5x+6=(x²+2x)+(3x+6)=x(x+2)+3(x+2)=(x+2)(x+3)

c)x²-7x+12=(x²-3x)-(4x-12)=x(x-3)-4(x-3)=(x-3)(x-4)

d)x²+7x+12=(x²+3x)+(4x+12)=x(x+3)+4(x+3)=(x+3)(x+4)

a: \(\left(2x-3\right)\cdot12=6^2\)

\(\Leftrightarrow2x-3=3\)

hay x=3

a) (2x-3).12=6²

=> (2x-3).12= 36

=> ( 2x-3)= 36 : 12

=> 2x-3 = 3

=> 2x = 3+3

=> 2x = 6

=> x = 6:2

=> x= 3

b)( 5x - 2 ) . 6³= 3. 6⁵
=> ( 5x - 2 ). 216= 23328

=> ( 5x - 2 ) = 23328 : 216

=> ( 5x - 2) = 108

=> 5x = 108 + 2

=> 5x = 110

=> x = 110 : 5

=> x = 22

a, \(4\left(18-5x\right)-12\left(3x-7\right)=15\left(2x-16\right)-6\left(x+14\right)\)

\(\Rightarrow72-20x-36x+84=30x-240-6x-84\)

\(\Rightarrow-20x-36x-30x+6x=-240-84-72-84\)

\(\Rightarrow-80x=-480\Rightarrow x=6\)

b, \(5\left(3x+5\right)-4\left(2x-3\right)=5x+3\left(2x+12\right)+1\)

\(\Rightarrow15x+25-8x+12=5x+6x+36+1\)

\(\Rightarrow15x-8x-5x-6x=36+1-25-12\)

\(\Rightarrow-4x=0\Rightarrow x=0\)

c, \(2\left(5x-8\right)-3\left(4x-5\right)=4\left(3x-4\right)+11\)

\(\Rightarrow10x-16-12x+15=12x-16+11\)

\(\Rightarrow10x-12x-12x=-16+11+16-15\)

\(\Rightarrow-14x=-4\Rightarrow x=\dfrac{2}{7}\)

d, \(5x-3\left\{4x-2\left[4x-3\left(5x-2\right)\right]\right\}=182\)

\(\Rightarrow5x-3\left[4x-2\left(4x-15x+6\right)\right]=182\)

\(\Rightarrow5x-3\left(4x-8x+30x-12\right)=182\)

\(\Rightarrow5x-12x+24x-90x+36=182\)

\(\Rightarrow-73x=182-36\)

\(\Rightarrow-73x=146\Rightarrow x=-2\)

Chúc bạn học tốt!!!

3,26 + 4/5 =?

làm nhanh lên giúp mình nhé

3,26+4/5=3,26+0,8=3,34

K cho mình cái

\(2\left(5x-8\right)-3\left(4x-5\right)=4\left(3x-4\right)+11\)

\(\Leftrightarrow10x-16-12x+15=12x+16+11\)

\(\Leftrightarrow-2x-1=12x+27\Leftrightarrow-14x-28=0\Leftrightarrow x=-2\)