Question

Alguém me ajuda por favoooor .

Matemática 10 pontos


Resolva as expressões

1) 20x-45-5x

2) 4x=-8x+36

3) 17x-2+4=14+5x

4) 5(2x-4)=7(x+1)-3

5) 5x-3(x+2)=16

6) 4(x+10)-2(x-5)=0

7) 4(x+3)-x=24+x

8) 10x+16=14x+8

9) 2(x-3)=-3(x-3)

10) 4(5x-3)-64(3-x)-3(12x-4)=96

Answer 1

oi
1) 20x-45-5x
15x-45

2)4x=-8x+36
4x+8x=36
12x=36
x=36

3) 17x-2+4=14+5x
17x-5x=14-4+2
12x=12
x=12/12
x=1

4) 5(2x-4)=7(x+1)-3
10x-20=7x+7-3
10x-7x=7-3+20
3x=24
x=24/3
x=8

5) 5x-3(x+2)=16
5x-3x-6=16
2x=16+6
2x=22
x=22/2
x=11

6) 4(x+10)-2(x-5)=0
4x+40-2x+10=0
4x-2x=-10-40
2x=-50
x=-50/2
x=-25

7) 4(x+3)-x=24+x
4x+12-x=24+x
4x-x-x=24-12
2x=12
x=12/2
x=6

8) 10x+16=14x+8
10x-14x=8-16
-4x=-8 (-1) a incógnita não pode ser negativo.
4x=8
x=8/4
x= 2

9) 2(x-3)=-3(x-3)
2x-6=-3x+9
2x+3x=9+6
5x=15
x=15/5
x=3

10) 4(5x-3)-64(3-x)-3(12x-4)=96
20x-12-192+64x-36x+12=96
20x+64x-36x=96 -12+192+12
48x = 192
x=192/48
x=4

Espero ter ajudado.