Упростите 1. (x-5)-(7-x)+(9-x) 2. b+(-7m+2n) 3. -3p-(-5x+2y) 4. –(a-4b)+(-8x+3y) 5....

Question

Упростите

1. (x-5)-(7-x)+(9-x)
2. b+(-7m+2n)
3. -3p-(-5x+2y)
4. –(a-4b)+(-8x+3y)
5. (a-9)-(13-a)+(11-a)
6. 7(4а + 6) – 12а

Answer 1

1. x-5-7+x+9-x= 2x-3
2. b-7m+2n
3. -3p+5x-2y
4. -a+4b-8x+3y  
5. a-9-13+a+11-a= 2a-11
6. 28a+42-12a= 16a+42

Answer 2

(х-5)-(7-х)+(9-х)=х-5-7+х+9-х=х-3

b+(-7m+2n)=b-7m+2n

-3p-(-5x+2y)=-3p+5x-2y=5x-3p-2y

-(a-4b)+(-8x+3y)=-a+4b-8x+3y=4b-a-8x+3y

(a-9)-(13-a)+(11-a)=a-9-13+a+11-a=a-11

Comments

7(4a+6)-12a=28a+42-12a=16a+42