1) 12*6 / 18* 4  2) 6*7*8 /7*8*9 

3) 15*13*6 / 6*9*5*26

4) 1/12 + 19/ 18

5)5 целых 1\3 + 3 целых 1/3

6) 2 целых 1\6 + 3 целых 1/9

7) 37/ 12 - 3 

8) (х-2) ( х-4 ) (х-1) (х-3) +( -5-3х) 

9) 3х=75

10) 6/ 5х=5 

11) х+2 - ( 2х-1 )= 6

12) 12/ 3х+7 =3 

13) 9 (х-7 во второй степени =14 - 2х 

14) корень в третьей степени - 5 = -3 

15) х + у=9 х- у= 3 
16) 6х-5у= 8 
17) 4х+7у=2
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