Question

tim y 

a     _{y x  3/4 + 2/5                                      b  y : 2/3 - 2 / 5 = 7/8}

 

Answer 1

help me tui tick cho

 

Answer 2

a) \(y\times\dfrac{3}{4}=\dfrac{2}{5}\)

\(y=\dfrac{2}{5}:\dfrac{3}{4}\\ y=\dfrac{8}{15}\)

b) \(y:\dfrac{2}{3}-\dfrac{2}{5}=\dfrac{7}{8}\)

\(y:\dfrac{2}{3}=\dfrac{7}{8}+\dfrac{2}{5}\\ y:\dfrac{2}{3}=\dfrac{51}{40}\\ y=\dfrac{51}{40}\times\dfrac{2}{3}\\ y=\dfrac{17}{20}\)

Answer 3

yx3/4=2/5

    y=2/5:3/4

     y=8/15

Answer 4

y:2/3-2/5=7/8

y:2/3=7/8+2/5

y:2/3=51/40

    y=51/40x2/3

y=17/20