Aiuto mi serve entro oggi!

[ValeSLB]

1-( 9 / 5 - x ) : 6 / 5 = x : 6 / 25

2- ( 15 / 8 - x ) : 1 / 18 0 x . 7 / 9

3- ( 4 / 15 + x ) : 17 / 12 = x : 35 / 36

4- ( 37 / 5 - x ) : 34 / 3 = x : 40 / 3

5- ( 28 / 15 - x ) : 31 / 4 = x : 25 / 4

6- ( 3 / 8 + x ) : 23 / 12 = x : 5 / 3

Grazie per chi mi aiuta!

[Ali Q]

Eccoli qui, postati freschi, freschi! Alla fine ce l'ho fatta!
Mi raccomando, Benfica, controlla bene i calcoli che ho fatto, via via che li ricopi, perchè stasera non garantisco. Mi sembra siano corretti, ma non si sa mai! Ciao, un bacione!

1-( 9 / 5 - x ) : 6 / 5 = x : 6 / 25

6/25 (9/5-x) = 6/5 x

54/125 –6/25 x = 6/5 x

54/125 = 6/5 x +6/25 x

54/125 = (30 +6)/25 x

54/125 = 36/25 x

x= 54/125 x 25/36 = 3/10


2- ( 15 / 8 - x ) : 1 / 18 = x : 7 / 9

7/9 (15/8 –x) = 1/18 x

35/24 –7/9 x = 1/18 x

35/24 = 1/18 x +7/9 x

35/24 = (1+14)/18 x

35/24 = 15/18 x

x= 35/24 x 18/15 = 7/4

3- ( 4 / 15 + x ) : 17 / 12 = x : 35 / 36

35/36 (4/15 +x) = 17/12 x

7/27 + 35/36 x =17/12 x

7/27 = 17/12 x –35/36 x

7/27 = (51-35)/36 x

7/27 = 16/36 x

7/27 = 4/9 x

x = 7/27 x 9/4 = 7/12


4- ( 37 / 5 - x ) : 34 / 3 = x : 40 / 3

40/3 (37/5 –x) = 34/3 x

296/3 –40/3 x = 34/3x

296/3 = 34/3 x +40/3 x

296/3 = 74/3 x

x= 296/3 x 3/74 = 4

5- ( 28 / 15 - x ) : 31 / 4 = x : 25 / 4

25/4 (28/15 –x) = 31/4 x

35/3 –25/4 x = 31/4 x

35/3 = 31/4 x +25/4 x

35/3 = 56/4 x

35/3 = 14 x

x= 35/3 x 1/14 = 5/6

6- ( 3 / 8 + x ) : 23 / 12 = x : 5 / 3

5/3 (3/8+x) = 23/12 x

5/8 +5/3 x = 23/12 x

5/8 = 23/12 x –5/3 x

5/8 = (23 – 20)/12 x

5/8 = 3/12 x

5/8 = 1/4 x

x = 5/8 x 4 = 5/2