Question

 

Tìm x biết : 2x . ( 3x + 1 ) + 3x . ( 4 - 2x ) = 7

Giúp tớ nhé

 

 

Answer 1

2x.(3x+1)+3x.(4-2x)=7

<=>2x.3x+2x+3x.4-3x.2x=7

<=>6x²+2x+12x-6x²=7

<=>2x+12x=7<=>14x=7<=>x=7/14=1/2

Vậy x=1/2

Answer 2

2x.(3x+1)+3x.(4-2x)=7

<=>2x.3x+2x+3x.4-3x.2x=7

<=>6x²+2x+12x-6x²=7

<=>2x+12x=7<=>14x=7<=>x=7/14=1/2

Vậy x=1/2

Answer 3

2x.(3x+1)+3x.(4-2x)=7

<=>2x.3x+2x+3x.4-3x.2x=7

<=>6x²+2x+12x-6x²=7

<=>2x+12x=7<=>14x=7<=>x=7/14=1/2

Vậy x=1/2