Question

a , 2/3x,1/2=1/10

b , 5 4/7:x=13

c , (x+1/2)×(2/3-2x)=0

d , 2/3x-1/2x=5/12

e , (x×6 2/7+3/7)×2 1/5-3/7=-2

Answer 1

a: \(\dfrac{2}{3}x-\dfrac{1}{2}=\dfrac{1}{10}\)

nên \(\dfrac{2}{3}x=\dfrac{1}{10}+\dfrac{1}{2}=\dfrac{6}{10}=\dfrac{3}{5}\)

hay \(x=\dfrac{3}{5}:\dfrac{2}{3}=\dfrac{9}{10}\)

b: \(\Leftrightarrow5-\dfrac{4}{7}x=13\)

nên 4/7x=-8

hay x=-12

c: \(\left(x+\dfrac{1}{2}\right)\cdot\left(\dfrac{2}{3}-2x\right)=0\)

=>x+1/2=0 hoặc 2/3-2x=0

=>x=-1/2 hoặc x=1/3

d: \(\dfrac{2}{3}x-\dfrac{1}{2}x=\dfrac{5}{12}\)

nên 1/6x=5/12

hay x=5/2