Question

Answer 1

10

9

-20

Answer 2

a)x.3=2.15

  x.3=30

  x=30:3

  x=10

Answer 3

\(a.=>x=15.2:3=10\\ b.=>x=\left(-3\right).\left(-15\right):5=9\\ c.=>x=5.16:\left(-4\right)=-20\)

Answer 4

a) x/15 = 2/3 ⇒ x . 3 = 15 . 2

x.3/3 = 15.2 /3

x = 15.2/3

x = 10

b) x/-15 = -3/5 ⇒ x . 5 = -15 . ( -3 )

x.5/5 = -15.(-3 )/5

x = -15.(-3)/5

x = 9

c) tương tự