Question

x/7 - 1/2 = 3 - 5/7

(x + 2/3) -1/5 = 7/15

Answer 1

\(\dfrac{x}{7}=3-\dfrac{5}{7}+\dfrac{1}{2}=\dfrac{39}{14}\Leftrightarrow2x=39\Leftrightarrow x=\dfrac{39}{2}\)

\(x+\dfrac{2}{3}=\dfrac{7}{15}+\dfrac{1}{5}=\dfrac{2}{3}\Leftrightarrow x=0\)

Answer 2

a: =>x/7=-5/7+3+1/2=-5/7+7/2=-10/14+49/14=39/14

=>x=39/14x7=39/2

b: =>x+2/3=7/15+1/5=7/15+3/15=10/15=2/3

hay x=0

Answer 3

gợi ý: Theo quy tắc tính giá trị của biết thức