8:x=-2

X:2=-4

-3x=12

(100-x)(99-x)(98-x)=0

2 la puterea 21 X +2 l puterea 22 = 2 la puterea 23


40 x=80

8 : x = - 2

x = 8 : ( - 2)

x = - 4

______

x : 2 = - 4

x = ( - 4 ) × 2

x = - 8

_______

- 3 x = 12

x = 12 : ( - 3)

x = - 4

________

( 100 - x ) ( 99 - x ) ( 98 - x ) = 0

Solutii:

100 - x = 0 ⇒ x = 100

99 - x = 0 ⇒ x = 99

98 - x = 0 ⇒ x = 98

_______________

2²¹ x + 2²² = 2 ²³

2²¹ x + 2²¹ₓ 2 = 2²¹ x 2²

2²¹ ( x + 2 ) = 2²¹ ₓ 2² l : 2²¹

x + 2 = 4

x = 4 - 2

x = 2

________

40 x = 80

x = 80 : 40

x = 2

8 : x = -2

x = 8 : (-2)

x = -4

x : 2 = -4

x = (-4)·2

x = -8

-3·x = 12

x = 12 : (-3)

x = - 4

(100 - x)·(99 - x)·(98 - x) = 0

100 - x = 0 => x = 100

99 - x = 0 => x = 99

98 - x = 0 => x = 98

2²¹·x + 2²² = 2²³

2²¹·x + 2²¹·2 = 2²¹·2²

2²¹·(x + 2) = 2²¹·2²

x + 2 = 4

x = 4 - 2

x = 2

40·x = 80

x = 80 : 40

x = 2