Question

pfv me ajudem, eu tenho que entregar hj!!!!valendo 50 pontos


9) 5x-3x=42

10) 6x-18=4x+8

11) x-5x-2=-18

12) x+5+2x=19+5+2x

13) 3x+20=2(x+3)

14) (5x-4).2=9x+10

15) -8+x=-3

16) x+x=62

17) -(x-1)=-10

18) 3(2x+1)-2(x-3)=0

19)
3x-1
------ =2
4

20)
3ㅤㅤㅤ2x-1
----ㅤㅤ------ㅤ
4ㅤㅤㅤ2



21)
1ㅤㅤㅤ4
-- x + --- x -3 =25
5ㅤㅤㅤ5


22)
1ㅤㅤ 1
-- x + --- x = x +1
2ㅤㅤ4

23)
ㅤx-1ㅤㅤ2x
4- ----- + ---- = 3
ㅤ2ㅤㅤ3

24)
x-1ㅤㅤ5ㅤㅤx
----- + ---- = ---
3ㅤㅤㅤ4ㅤㅤ2


25) 2-8x=x+10

26) x-(5x-3)=2x+(1+x)

27) 3x+1=4

28) 55x+11x=35-24

29)
ㅤㅤ1-xㅤㅤ1
x- -------- + ----- =2x
ㅤㅤ2ㅤㅤㅤ4

30) 3(x-2)=2+2(2+x)​

Answer 1

Resposta:

9)

5x - 3x = 42

2x = 42

$x = \frac{42}{2} \\ \\ \red{x = 21}$

10)

$6x - 18 = 4x + 8 \\ \\ 6x - 4x = 8 + 18 \\ \\ 2x = 26 \\ \\ x = \frac{26}{2} \\ \\ \red{ x =13}$

11)

$x - 5x - 2 = - 18 \\ \\ - 4x = - 18 + 2 \\ \\ - 4x = - 16 \\ \\ - 16 = - 4x \\ \\ 4x = 16 \\ \\ x = \frac{16}{4} \\ \\ \red{x = 4}$

12)

$x + 5 + 2x = 19 + 5 + 2x \\ \\3 x + 5 = 24 + 2x \\ \\ 3x - 2x = 24 - 5 \\ \\ \red{x = 19}$

13)

$3x + 20 = 2(x + 3) \\ \\ 3x + 20 = 2x + 6 \\ \\ 3x - 2x = 6 - 20 \\ \\ \red{ x = - 14}$

14)

$(5x - 4).2 = 9x + 10 \\ \\ 10x - 8 = 9x + 10 \\ \\ 10x - 9x = 10 + 8 \\ \\ \red{x = 18}$

15)

$- 8 + x = - 3 \\ \\ x = - 3 + 8 \\ \\ \red{ x = 5}$

16)

$x + x = 62 \\ \\ 2x = 62 \\ \\ x = \frac{62}{2} \\ \\ \red{ x = 31}$

17)

$- (x - 1) = - 10 \\ \\ - x + 1 = - 10 \\ \\ - x = - 10 + 1 \\ \\ - x = -9 \\ \\ - 9 = -x \\ \\ \red{ x = 9}$

18)

$3(2x + 1) - 2(x - 3) = 0 \\ \\ 6x + 3 - 2x + 6 = 0 \\ \\ 4x + 9 = 0 \\ \\ 4x = - 9 \\ \\ \red{x = - \frac{9 }{4} }$

19)

$\frac{3x - 1}{4} = 2 \\ \\ 3x - 1 = 4 \times 2 \\ \\ 3x - 1 = 8 \\ \\ 3x = 8 + 1 \\ \\ 3x = 9 \\ \\ x = \frac{9}{3} \\ \\ \red{x = 3}$

20)

$\frac{3}{4} = \frac{2x - 1}{2} \\ \\ 4(2x - 1) = 3 \times 2 \\ \\ 8x - 4 = 6 \\ \\ 8x = 6 + 4 \\ \\ 8x = 10 \\ \\ x = \frac{10 \div 2}{8 \div 2} \\ \\ \red{x = \dfrac{5}{4} }$

21)

$\frac{1x}{5} + \frac{4x}{5} - 3 = 25 \\ \\ \frac{5x}{5} - 3 = 25 \\ \\ x - 3 = 25 \\ \\ x = 25 + 3 \\ \\ \red{x = 28}$

22)

$\frac{1x}{2} + \frac{1x}{4} = x + 1 \\ \\ \frac{4x + 2x = 8x + 8}{8} \\ \\ 4x + 2x = 8x + 8 \\ \\ 6x = 8x + 8 \\ \\ 8x + 8 = 6x \\ \\ 8x - 6x = - 8 \\ \\ 2x = - 8 \\ \\ x = - \frac{8}{2} \\ \\ \red{ x = - 4}$

23)

$4 - \frac{x - 1}{2} + \frac{2x}{3} = 3 \\ \\ \frac{6 \times 4 -3 (x - 1) + 2 \times 2x = 6 \times 3}{6} \\ \\ 6 \times 4 - 3(x - 1) + 2 \times 2x = 6 \times 3 \\ \\ 24 - 3x + 3 + 4x = 18 \\ \\ x + 27= 18 \\ \\ x = 18 - 27 \\ \\ \red{ x = - 9}$

24)

$\frac{x - 1}{3} + \frac{5}{4} = \frac{x}{2} \\ \\ \frac{4(x - 1) + 3 \times 5 = 6 \times x}{12} \\ \\ 4(x - 1) + 3 \times 5 = 6 \times x \\ \\ 4x - 4 + 15 = 6x \\ \\ 4x + 11 = 6x \\ \\ 6x = 4x+ 11 \\ \\ 6x - 4x = 11 \\ \\ 2x = 11 \\ \\ \red{x = \dfrac{11}{2} }$

25)

$2 - 8x = x + 10 \\ \\ x + 10 = 2 - 8x \\ \\ x+ 8x = 2 - 10 \\ \\ 9x = - 8 \\ \\ \red{x = - \dfrac{8}{9} }$

26)

$x - (5x - 3) = 2x + (1 + x) \\ \\ x - 5x + 3 = 2x + 1 + x \\ \\ - 4x + 3 = 3x + 1 \\ \\ 3x + 1 = - 4x + 3 \\ \\ 3x + 4x = 3 - 1 \\ \\ 7x = 2 \\ \\ \red{x = \frac{2}{7} }$

27)

$3x + 1 = 4 \\ \\ 3x = 4 - 1 \\ \\ 3x = 3 \\ \\ x = \frac{3}{3} \\ \\ \red{x = 1}$

28)

$55x + 11x = 35 - 24 \\ \\ 66x = 11 \\ \\ x = \frac{11 \div 11}{66 \div 11} \\ \\ \red{ x = \dfrac{1}{6} }$

29)

$x - \frac{1 - x}{2} + \frac{1}{4 } = 2x \\ \\ \frac{8x - 4(1 - x) + 2 \times 1 = 8 \times 2x}{8} \\ \\ 8x - 4(1 - x) + 2 \times 1 = 8 \times 2x \\ \\ 8x - 4 + 4x + 2 = 16x \\ \\ 12x - 2 = 16x \\ \\ 16x = 12x - 2 \\ \\ 16x - 12x = - 2 \\ \\ 4x = - 2 \\ \\ x = - \frac{2 \div 2}{4 \div 2} \\ \\ \red{x = - \dfrac{1}{2} }$

30)

$3(x - 2) = 2 + 2(2 + x) \\ \\ 3x - 6 = 2 + 4 + 2x \\ \\ 3x - 6 = 6 + 2x \\ \\ 3x - 2x = 6 + 6 \\ \\ \red{ x = 12}$

Bons Estudos!