Действия с обыкновенными дробями, .(фото есть)решать надо с 16 по 30 пример.

1) ( 6/5 - 3/4 ) × 2/3 = 9/20 × 2/3 = 3/10 ;

2) ( 6/5 - 2/3 ) × 1/2 = 8/15 × 1/2 = 4/15 ;

3) 11/18 - 4/9 × 3/16 = 11/18 - 1/12 = 19/36 ;

4) 29/30 - 5/18 × 6/25 = 29/30 - 1/15 = 9/10 ;

5) 8/5 × ( 3/4 + 11/8 ) = 8/5 × 2 1/8 = 3 2/5 ;

6) 18/7 × ( 4/9 + 15/8 ) = 18/7 × 2 23/72 =

2 27/28 ;

7) 8/5 × 3/4 + 11/8 = 1 1/5 + 11/8 = 2 23/40 ;

8) - 1/3 × 6/5 - 5/6 × 3/25 = ( - 2/5 ) - 1/10 =

( - 1/2 ) ;

9) 18/7 × 4/9 + 15/14 = 8/7 + 15/4 = 1 129/238 ;

10) - 1/4 × 8/6 - 7/18 × 9/21 = ( - 1/3 ) - 1/6 =

( - 1/2 ) ;

11) - 27/20 × ( - 5/9 ) - 5/24 × ( - 22/5 ) =

3/4 - ( -11/12 ) = 1 2/3 ;

12) - 36/60 × ( - 5/18 ) - ( - 21/56 ) × ( - 1/3 ) =

1/6 - 1/8 = 1/24 ;

13) 15 × ( 1 + 1/3 - 1/5 ) = 15 × ( 1 1/3 - 1/5 ) =

15 × 1 2/5 = 17 ;

14) 72 × ( 19/24 - 7/12 + 3/8 ) = 72 × ( 5/24 + 3/8 ) = 72 × 7/12 = 42 ;

15) 72/23 × 34/65 + 72/73 × 39/65 =

1 953/1495 + 216/365 = 2 25018/109135 ;

16) 107/89 × 64/70 + 107/89 × 25/70 =

1 309/3115 + 535/1246 = 1 37/40 ;

17) 45/46 × 49/51 - 45/46 × 3/51 =

735/182 - 2 573/850 = - 1 7177/ 9775 ;

18) 34/74 × 122/55 - 34/74 × 48/ 55 =

1 6/55 - 816/2035 = 131/185 ;

19) 3/25 × ( - 5/49 ) + 22/25 × ( - 5/49 ) =

( - 3/245 ) + ( - 22/45 ) = ( - 5/49 ) ;

20) 7/36 × ( - 6/50 ) + 29/36 × ( - 6/50 ) =

( - 7/300 ) + ( - 29/300 ) = - 3/25 ;

21) ( 7-56/36 : 49/6 ) × 6/7 =

( ( - 49 ) / 36 : 49/6 ) × 6,7 =

( ( - 1 13/36 ) : 49/6 ) × 6/7 = ( - 1/6 ) × 6/7 =

(- 1/7 ) ;

22) ( 12-76/81 : 64/9 ) × 9/37 =

( ( - 64/81 ) : 64/9 ) × 9/37 =

( ( - 64/81 ) : 64/9 ) × 9/37 = -1/9 × 9/37 =

( - 1/ 37 ) ;

23) ( 12/7 - 20/21 ) × 56/16 = 16/21 × 56/16 =

2 2/3 ;

24) ( 8/11 - 20/55 ) × 66/20 = 4/11 × 6/20 =

1 1/5 ;

25) 3/10 × ( - 5/8 ) + 3/4 × ( - 4/9 ) =

( - 3/16 ) + ( - 1/3 ) = ( - 25/48 ) ;

26) 4/15 × ( - 5/8 ) + 3/4 × ( - 4/9 ) =

( - 1/6 ) + ( - 1/3 ) = ( - 1/2 ) ;

27) 74 - 26 / 25 : 48/ ( - 5 ) × 15/4 =

48/25 : ( - 9 3/5 ) × 15/4 = 1 23/25 : ( - 9 3/5 ) ×

15/4 = ( - 1/5 ) × 15/4 = ( - 3/4 ) ;

28) 13-69 / 42 : 56/6 × 7/4 =

( - 56 )/42 : 56/6 × 7/4 = ( - 1 1/3 ) : 56/6 × 7/4 = ( - 1/7 ) × 7/4 = ( - 1 1/4 ) ;

29) ( 7/6 - 1/12 + 1/36 ) × 72/34 =

( 1 1/12 + 1/36 ) × 72/34 = 1 1/9 × 72/34 =

2 6/17 ;

30) ( 8/7 - 1/14 + 1/42 ) × 12/46 =

( 1 1/14 + 1/42 ) × 12/46 =

1 2/21 × 12/46 = 2/7 ;