Раскрытие скобок

№ 1 Раскройте скобки

1. – (а – b)

2. – (2a + 3c – 4b)

3. – (2 – a – 4n)

4. – 2( 3 + 2c)

5. – 3(4c – 2a)

6. 5(4 – 2c)

7. – 2(3 – 3n + 4m)

8. – 4 (a – 4c + 6d - n)

№ 2  Раскройте скобки и найдите значение выражений:

1. 5,7 + (8,1 – 4,7)‏    

2. 3,39 – (1,39 – 4,5)‏                                               

3. 3,7 - (-5,3 + 3,7)                                                   

4. 4,9 - (4,9 - 2,4)                                                     

5. 6,8 + (-2,8 - 6,8) 

6. - 6,1 + (-4,8 + 6,1)                                               

7. -0,56 + (3,8 - 2,44)

8. -0,37 + (4,2 - 4,63)                                               

9. -8,27 - (-3,4 + 3,73)                                             

10.   -2,78 + (7,78 - 1,3)                                                 

11.   (2 - 1,51) - (3,13 - 0,51) + (0,13 - 0,5)               

12.   -(0,39 + 2,1) + (0,13 • 3 - 2,1) - 0,8                     

13.   (4,3918 - 16,4) - (4,3917 - 4,1 • 4)

14.   (3,29 + 1) - (1,2 + 1) - (1 - 0,91)

№ 3  Раскройте скобки и упростите выражение

1. x-(x -y)

2. a - (b + a)                                                                         

3. (m - n ) + n                                                                      

4. (x + y) - y                                                                            

5. 5– (3 + x)                                                                         

6. – x + (x + 2,7)                                                                     

7. – (– в + 3,8) + 0,7                                                          

8. 4,74 – ( 2а + 3,7)‏                                                         

№4 Раскройте скобки и упростите выражение

1. - (1 - x) - (5,1 + x)     

2. - (a - x - 3) - (x - a + 2)

3. (a + 3,3 - a) - (3,3 + x)

4. (c + 4,9) - (5,4 + c)

5. (n - 5,8) - (4,9 + n)

6. (6,08 + a) - (a + 9,3)

7. - (m - 3,8) + (4,12 + m)

8. - (2,43 + x - b) - (2,43 + b - x)

9. - (1,53 - x + 1) - (x - a - 2,53)

10.   - (a - x) - (5,1 + x) + a - 5,1

11.   (b - x) - (a - x) + (a - b)

12.   - (a + 3,3) - (x - a) - 3,3 + x

13.   (2,43 + 1,1) - (b + 2,43) + (b - 1,1)

14.   (1,53 - x + a) - (x - 1,53 - a) - a

15.   - (a - 1,21) - (1 - a) - (0,21 - a)