пожалуйста сделайте два варианта даю 33 балла

I вариант:

1. 3a-5a = 3*(-3)-5*(-3) = 3*9+15=  37+15 = 42

2. a) -5x+3x-9x+15x = 18x-14x

b) 3aa-5a*3b-12bbb = 3a-15ab-12b

3. a) (2a-6b)+(-3a+2b) = 2a-6b-3a+2b = -a-4b

b) (-2x-3a+4)-(-2x+7x-6) = -2x-3x+4+2x-7x+6 = -10x+10

4. a) -2ab(1,2ab+0,4ab) = -2,4ab-0,8a^5b

b) 7a(a-b)-b(b-7a) = 7a-7ab-b+7ab = 7a-b

5. a) 5-2(x-1)+3(x-2)=0

5-2x+2+3x-6 = 0

x+1 = 0

x = -1

b) 3x-5(2x-1) = 12

3x-10x+5 = 12

-7x = 12-5

-7x = 7

x = -1

6. 6xy-2x-(3xy+4x+1)-(-xy-2x-1) =  6xy-2x-3xy-4x-1+xy+2x+1 = -4x-2xy

II вариант:

1. 5a-3a = 5*(-3)-3*(-3) = 5*9+9 = 45+9 = 54

2. a) -4y+7y-5y+3y = 10y-9y

b) -4xx-2x*3y+15yy = -4x^4-6xy+15y

3. a) (7a-9b)+(-3b+2a) = 7a-9b-3b+2a = 9a-12b

b) (-3x-5x+1)-(-3x+2x-9) = -3x-5x+1+3x-2x+9 = -7x+10

4. a) -3ab(0,8a+0,3b) = -2,4ab-0,9ab

b) 3x(x-2a)-6a(a-x) = 3x-6ax-6a+6ax = 3x-6a

5. a) 7+4(x-2)-3(x-1) = 0

7+4x-8-3x+3 = 0

x+2 = 0

x = -2

b) 2x-7(3x-1) = 26

2x-21x+7 = 26

-19x = 26-7

-19x = 19

x = -1

6. -(2ab-ab+b)+3ab-4b-(5ab-ab) = -2ab+ab-b+3ab-4b-5ab+ab = 2ab-4ab-5b