Question

GIẢI CÁC PHƯƠNG TRÌNH

a) \(x-\dfrac{5x+2}{6}=\dfrac{7-3x}{4}\)

b) \(\dfrac{10x+3}{12}=1+\dfrac{6+8x}{9}\)

c) \(\dfrac{x}{3}-\dfrac{2x+1}{2}=\dfrac{x}{6}x\)

d) \(\dfrac{2+x}{3}-\dfrac{1}{2}x=\dfrac{1-2x}{4}+\dfrac{1}{4}\)

Answer 1

a,\(x-\frac{5x+2}{6}=\frac{7-3x}{4}\)

=> \(\frac{12x}{12}-\frac{\left(5x+2\right)2}{12}=\frac{\left(7-3x\right)3}{12}\)

=>\(\frac{12x-10x-4}{12}=\frac{21-9x}{12}\)

=>(khử mẫu)

=>\(12x-10x-4=21-9x\)

=>11x=25

=>x=25/11

Answer 2

b: \(\Leftrightarrow3\left(10x+3\right)=36+4\left(8x+6\right)\)

=>30x+9=36+32x+24

=>32x+60=30x+9

=>2x=-51

=>x=-51/2

c: \(\Leftrightarrow2x-3\left(2x+1\right)=x+6x\)

=>7x=2x-6x-3

=>7x=-4x-3

=>11x=-3

=>x=-3/11

d: \(\Leftrightarrow4\left(x+2\right)-6x=3\left(1-2x+1\right)\)

=>4x+8-6x=3(-2x+2)

=>-2x+8+6x-6=0

=>4x+2=0

=>x=-1/2