Question

fratele meu ajutatima va rog e aproape ora 11 noaptea și eu nu mi-am terminat tema,va rog e urgent rău de tot,dau coroana​

Answer 1

a) x/7 = 5/21

21x = 5 × 7

21x = 35 → x = 35/21 = 5/3

b) 0,(3)/x = 0,3/9

1/3x = 3/10/9

1/3x = 1/30 <=> 3x = 30 → x = 3 : 30 = 10

c) 1/4/2 = 3/2/x

1/8 = 3/2x

1 × 2x = 3 × 8

2x = 24 → x = 24 : 2 = 12

d) x/(2⁵:2³) = 1998⁰/(4⁰+3 )

x/2² = 1/(1+3 )

x/4 = 1/4 → x = 1

e) [3¹⁰⁰ : (3³)³³]/(2x + 5) = 1/[1,(3) + 1,3]

(3¹⁰⁰ : 3⁹⁹)/(2x + 5) = 1/(12/9 + 13/10)

3/2x + 5 = 1/79/30

3/2x + 5 = 30/79 <=> 3 × 79 = 30 × (2x + 5)

237 = 60x + 150

- 60x = 150 - 237

- 60x = - 87 <=> 60x = 87 → x = 87/60 = 29/20

f) 2/6 = 7/(4x + 1)

1/3 = 7/(4x + 1)

1(4x + 1) = 7 × 3

4x + 1 = 21

4x = 21 - 1 = 20 → x = 20 : 4 = 5

g) 1313131313/22222222 = 13x/22

13/22 = 13x/22

13 = 13x <=> 13x = 13 → x = 13 : 13 = 1