Question

2. Tìm x biết:

a) 14,58 - x= -3,72

b) 3/4 + 1/2.x= -5/6

Answer 1

`a) 14,58 - x= -3,72`

`=> x= 14,58 - ( -3,72)`

`=> x= 14,58+ 3,72`

`=>x=18,3`

`b)3/4 + 1/2.x= -5/6`

`=>  1/2.x= -5/6-3/4`

`=>  1/2.x= -19/12``=>x=-19/12 : 1/2``=>x=-19/12xx2``=>x= -19/6`

Answer 2

\(a)14,58-x=-3,72\\ x=14,58-\left(-3,72\right)\\ x=14,58+3,72\\ x=18,3\\ b)\dfrac{3}{4}+\dfrac{1}{2}.x=-\dfrac{5}{6}\\ \dfrac{1}{2}.x=-\dfrac{5}{6}-\dfrac{3}{4}\\ \dfrac{1}{2}.x=-\dfrac{19}{12}\\ x=-\dfrac{19}{12}:\dfrac{1}{2}\\ x=-\dfrac{19}{6}.\)

Answer 3

Answer 4

a ) 14 , 58 − x = − 3 , 72 ⇒ x = 14 , 58 − ( − 3 , 72 ) ⇒ x = 14 , 58 + 3 , 72 ⇒ x = 18 , 3 b ) 3 4 + 1 2 . x = − 5 6 ⇒ 1 2 . x = − 5 6 − 3 4 ⇒ 1 2 . x = − 19 12 ⇒ x = − 19 12 : 1 2 ⇒ x = − 19 12 × 2 ⇒ x = − 19 6