Question

giải các pt:

a)3x-2=2x-3 b)5-(x-6)=4(3-2x) c)\(\dfrac{7x-1}{6}\)+2x=\(\dfrac{16-x}{5}\) d)4(0,5-1,5x)=-\(\dfrac{5x-6}{3}\)

Answer 1

a.

3x - 2 = 2x - 3

<=> 3x -2x = -3+2

<=> x = -1

Vậy.............

b.

\(5-\left(x-6\right)=4\left(3-2x\right)\)

\(\Leftrightarrow5-x+6=12-8x\)

\(\Leftrightarrow7x=1\)

\(\Leftrightarrow x=\dfrac{1}{7}\)

Vậy..........

Answer 2

Answer 3

c.

\(\dfrac{7x-1}{6}+2x=\dfrac{16-x}{5}\)

\(\Leftrightarrow5\left(7x-1\right)+2x.30=6\left(16-x\right)\)

\(\Leftrightarrow35x-5+60x=96-6x\)

\(\Leftrightarrow101x=101\)

\(\Leftrightarrow x=1\)

Vậy ......

Answer 4

câu d

còn một câu làm nốt đỡ cô đơn

\(4\left(0,5-1,5x\right)=-\dfrac{5x-6}{3}\)\(\Leftrightarrow4\left(\dfrac{1}{2}-\dfrac{3}{2}x\right)=-\dfrac{5x-6}{3}\)\(\Leftrightarrow6x-2=\dfrac{5x-6}{3}\)

\(6x=\dfrac{5x-6}{3}+2=\dfrac{5x-6+6}{3}=\dfrac{5x}{3}\)

x=0