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Proszę o pomoc!! 20 pkt

Proszę O Pomoc 20 Pkt class=

Odpowiedź :

C40cviz

e)

[tex]\frac{4x + 4}{5} = \frac{9x - 9}{4}[/tex]            | * 20

4 (4x +4) = 5(9x - 9)

16x + 16 = 45x - 45

61 = 29x       | ÷ 29

x = [tex]\frac{61}{29}[/tex] = [tex]2\frac{3}{29}[/tex]

f)

[tex]\frac{64+8x}{7} = 3x - \frac{3}{8}[/tex]          | * 56

512 + 64x =  168x - 21

533 = 104x         | ÷104

x = [tex]\frac{533}{104}[/tex] = 5[tex]\frac{13}{104}[/tex] = [tex]5\frac{1}{8}[/tex]

g)

[tex]\frac{-12x + 80}{6} = \frac{-1-11x}{4}[/tex]        | * 24

-48x + 320 = -6 -66x

18x = -326        | ÷ 18

x = [tex]-\frac{326}{18}[/tex] = [tex]-18\frac{1}{9}[/tex]

h)

[tex]\frac{2x -6 -9 +3x}{3} = \frac{-x-4}{2}[/tex]        | * 6

4x - 12 - 18 + 6x = -3x -12

13x = 18               | ÷13

x =  [tex]\frac{13}{18}[/tex]

Tojamikiviz

Odpowiedź:

e)

[2 * (2x + 2)]/5 = [3 * (3x - 3)]/4

2/5 * (2x + 2) = 3/4 * (3x - 3)

4/5x + 4/5 = 9/4x - 9/4

0,8x - 2 1/4x = -2 1/4 - 4/5

0,8x - 2,25x = -2,25 - 0,8

-1,45x = -3,05      /:(-1,45)

x = 305/100 : 145/100 = 305/100 * 100/145 = 61/29 = 1 3/29

f)

8 * (8 + x)/7 = 3(x - 1/8)

8/7 * 8 + 8/7x = 3x - 1/8

9/7x - 3x = -1/8 - 64/8

1 2/7x -  3x = -65/8

-1 5/7x = -65/8

-12/7x = -65/7        /*(-7/12)

x = 65/7 * 7/12 = 65/12 = 5 5/12

g)

-4 * (3x - 20)/6 = (-1 - 11x)/4

-2/3(3x - 20) = -1/4 - 11/4x

-2x + 40/3 = -1/4 - 11/4x

-2x + 2 3/4x = -1/4 - 13 1/3

3/4x = -3/12 - 13 4/12        /*4/3

x = -13 7/12 * 4/3 = -163/12 * 4/3 = -163/9 = -18 1/9

h)

[2 * (x - 3) - 3 * (3 - x)]/3 = -(x + 4)/2

(2x - 6 - 9 + 3x)/3 = -1/2x - 2

2/3x - 15/3 + x = -1/2x - 2

1 2/3x + 1/2x = -2 + 5

1 4/6x + 3/6x = 3

1 7/6x = 3

13/6x = 3       /*6/13

x = 3 * 6/13 = 18/13 = 1 5/13

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