Question

RESOLVA:

a) 15 + 23 + 18 + 10
_ _ _ _ =
8 12 15 5

b) 1 - 2 - 3 - 4 =
_ _ _ _
98 98 98 98

c) 3x - 1x + 20 = 10 +6x -30

d)30 - 20 + 2x = 10



OBS: COM CÁLCULO, POR FAVOR

Answer 1

As letras A e B eu não entendi, então vou responder as demais:

c) 3x - 1x + 20 = 10 + 6x - 30

2x - 6x = - 20 - 20

- 4 x = - 40

x = 40 / 4

x = 10

d) 30 - 20 + 2x = 10

2 x = 10 - 30 + 20

2x = 0

x = 0

Answer 2

a) 15 + 23 + 18 + 10---->mmc(8-12-15-5)120
_ _ _ _ =
8 12 15 5


225+230+144+240
-----------------------------==
120


839
-------
120



b) 1 - 2 - 3 - 4 = mmc(98 )
_ _ _ _
98 98 98 98


1-2-3-4
------------==
98


-8
----div(4) ambos
98


-4
----
49








c) 3x - 1x + 20 = 10 +6x -30

2x-6x= -20 -20

-4x= - 40*(-1)

x= 10



d)30 - 20 + 2x = 10


2x= 10 -10

x= 0/2

x=0